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* SUNRPC: introduce per-task RPC iostatsChuck Lever2006-03-201-0/+1
| | | | | | | | | | | | | | Account for various things that occur while an RPC task is executed. Separate timers for RPC round trip and RPC execution time show how long RPC requests wait in queue before being sent. Eventually these will be accumulated at xprt_release time in one place where they can be viewed from userland. Test plan: Compile kernel with CONFIG_NFS enabled. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: add a handful of per-xprt countersChuck Lever2006-03-201-0/+48
| | | | | | | | | | | Monitor generic transport events. Add a transport switch callout to format transport counters for export to user-land. Test plan: Compile kernel with CONFIG_NFS enabled. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: Ensure client closes the socket when server initiates a closeTrond Myklebust2006-01-061-2/+10
| | | | | | | | | | | | If the server decides to close the RPC socket, we currently don't actually respond until either another RPC call is scheduled, or until xprt_autoclose() gets called by the socket expiry timer (which may be up to 5 minutes later). This patch ensures that xprt_autoclose() is called much sooner if the server closes the socket. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: transport switch API for setting port numberChuck Lever2006-01-061-0/+14
| | | | | | | | | | | | | | | At some point, transport endpoint addresses will no longer be IPv4. To hide the structure of the rpc_xprt's address field from ULPs and port mappers, add an API for setting the port number during an RPC bind operation. Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with UDP and TCP. NFSv2/3 and NFSv4 mounting should be carefully checked. Probably need to rig a server where certain services aren't running, or that returns an error for some typical operation. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: switchable buffer allocationChuck Lever2006-01-061-0/+5
| | | | | | | | | | | | | | | | | | | | Add RPC client transport switch support for replacing buffer management on a per-transport basis. In the current IPv4 socket transport implementation, RPC buffers are allocated as needed for each RPC message that is sent. Some transport implementations may choose to use pre-allocated buffers for encoding, sending, receiving, and unmarshalling RPC messages, however. For transports capable of direct data placement, the buffers can be carved out of a pre-registered area of memory rather than from a slab cache. Test-plan: Millions of fsx operations. Performance characterization with "sio" and "iozone". Use oprofile and other tools to look for significant regression in CPU utilization. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* RPC: Do not block on skb allocationTrond Myklebust2005-12-191-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | If we get something like the following, [ 125.300636] [<c04086e1>] schedule_timeout+0x54/0xa5 [ 125.305931] [<c040866e>] io_schedule_timeout+0x29/0x33 [ 125.311495] [<c02880c4>] blk_congestion_wait+0x70/0x85 [ 125.317058] [<c014136b>] throttle_vm_writeout+0x69/0x7d [ 125.322720] [<c014714d>] shrink_zone+0xe0/0xfa [ 125.327560] [<c01471d4>] shrink_caches+0x6d/0x6f [ 125.332581] [<c01472a6>] try_to_free_pages+0xd0/0x1b5 [ 125.338056] [<c013fa4b>] __alloc_pages+0x135/0x2e8 [ 125.343258] [<c03b74ad>] tcp_sendmsg+0xaa0/0xb78 [ 125.348281] [<c03d4666>] inet_sendmsg+0x48/0x53 [ 125.353212] [<c0388716>] sock_sendmsg+0xb8/0xd3 [ 125.358147] [<c0388773>] kernel_sendmsg+0x42/0x4f [ 125.363259] [<c038bc00>] sock_no_sendpage+0x5e/0x77 [ 125.368556] [<c03ee7af>] xs_tcp_send_request+0x2af/0x375 then the socket is blocked until memory is reclaimed, and no progress can ever be made. Try to access the emergency pools by using GFP_ATOMIC. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* SUNRPC: allow sunrpc.o to link when CONFIG_SYSCTL is disabledChuck Lever2005-11-041-0/+9
| | | | | | | | | | | | | | The sunrpc module should build properly even when CONFIG_SYSCTL is disabled. Reported by Jan-Benedict Glaw. Test plan: Compile kernel with CONFIG_NFS as a module and built-in, and CONFIG_SYSCTL enabled and disabled. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: rationalize set_buffer_sizeChuck Lever2005-09-231-15/+15
| | | | | | | | | | In fact, ->set_buffer_size should be completely functionless for non-UDP. Test-plan: Check socket buffer size on UDP sockets over time. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: parametrize various transport connect timeoutsChuck Lever2005-09-231-2/+66
| | | | | | | | | | | | | | | | | Each transport implementation can now set unique bind, connect, reestablishment, and idle timeout values. These are variables, allowing the values to be modified dynamically. This permits exponential backoff of any of these values, for instance. As an example, we implement exponential backoff for the connection reestablishment timeout. Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with UDP and TCP. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: make sure to get the same local port number when reconnectingChuck Lever2005-09-231-12/+53
| | | | | | | | | | | | | | | | Implement a best practice: if the remote end drops our connection, try to reconnect using the same port number. This is important because the NFS server's Duplicate Reply Cache often hashes on the source port number. If the client reuses the port number when it reconnects, the server's DRC will be more effective. Based on suggestions by Mike Eisler, Olaf Kirch, and Alexey Kuznetsky. Test-plan: Destructive testing. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: allow RPC client's port range to be adjustableChuck Lever2005-09-231-15/+8
| | | | | | | | | | | | | | | | | Select an RPC client source port between 650 and 1023 instead of between 1 and 800. The old range conflicts with a number of network services. Provide sysctls to allow admins to select a different port range. Note that this doesn't affect user-level RPC library behavior, which still uses 1 to 800. Based on a suggestion by Olaf Kirch <okir@suse.de>. Test-plan: Repeated mount and unmount. Destructive testing. Idle timeouts. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: clean up after nocong was removedChuck Lever2005-09-231-2/+0
| | | | | | | | | | | | Clean-up: Move some macros that are specific to the Van Jacobson implementation into xprt.c. Get rid of the cong_wait field in rpc_xprt, which is no longer used. Get rid of xprt_clear_backlog. Test-plan: Compile with CONFIG_NFS enabled. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: remove xprt->nocongChuck Lever2005-09-231-2/+0
| | | | | | | | | | | Get rid of the "xprt->nocong" variable. Test-plan: Use WAN simulation to cause sporadic bursty packet loss with UDP mounts. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: add a release_rqst callout to the RPC transport switchChuck Lever2005-09-231-0/+1
| | | | | | | | | | | | | | The final place where congestion control state is adjusted is in xprt_release, where each request is finally released. Add a callout there to allow transports to perform additional processing when a request is about to be released. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: add generic interface for adjusting the congestion windowChuck Lever2005-09-231-8/+5
| | | | | | | | | | | | A new interface that allows transports to adjust their congestion window using the Van Jacobson implementation in xprt.c is provided. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: separate xprt_timer implementationsChuck Lever2005-09-231-0/+12
| | | | | | | | | | | | | Allow transports to hook the retransmit timer interrupt. Some transports calculate their congestion window here so that a retransmit timeout has immediate effect on the congestion window. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: expose API for serializing access to RPC transportsChuck Lever2005-09-231-0/+2
| | | | | | | | | | | | | | | | | The next method we abstract is the one that releases a transport, allowing another task to have access to the transport. Again, one generic version of this is provided for transports that don't need the RPC client to perform congestion control, and one version is for transports that can use the original Van Jacobson implementation in xprt.c. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: expose API for serializing access to RPC transportsChuck Lever2005-09-231-0/+2
| | | | | | | | | | | | | | | | | | | | | | | | | | | | The next several patches introduce an API that allows transports to choose whether the RPC client provides congestion control or whether the transport itself provides it. The first method we abstract is the one that serializes access to the RPC transport to prevent the bytes from different requests from mingling together. This method provides proper request serialization and the opportunity to prevent new requests from being started because the transport is congested. The normal situation is for the transport to handle congestion control itself. Although NFS over UDP was first, it has been recognized after years of experience that having the transport provide congestion control is much better than doing it in the RPC client. Thus TCP, and probably every future transport implementation, will use the default method, xprt_lock_write, provided in xprt.c, which does not provide any kind of congestion control. UDP can continue using the xprt.c-provided Van Jacobson congestion avoidance implementation. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: add API to set transport-specific timeoutsChuck Lever2005-09-231-0/+2
| | | | | | | | | | | | | | | | | Prepare the way to remove the "xprt->nocong" variable by adding a callout to the RPC client transport switch API to handle setting RPC retransmit timeouts. Add a pair of generic helper functions that provide the ability to set a simple fixed timeout, or to set a timeout based on the state of a round- trip estimator. Test-plan: Use WAN simulation to cause sporadic bursty packet loss. Look for significant regression in performance or client stability. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: get rid of xprt->streamChuck Lever2005-09-231-10/+18
| | | | | | | | | | | | Now we can fix up the last few places that use the "xprt->stream" variable, and get rid of it from the rpc_xprt structure. Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with UDP and TCP. Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: skip over transport-specific heads automaticallyChuck Lever2005-09-231-7/+17
| | | | | | | | | | | | | Add a generic mechanism for skipping over transport-specific headers when constructing an RPC request. This removes another "xprt->stream" dependency. Test-plan: Write-intensive workload on a single mount point (try both UDP and TCP). Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: separate TCP and UDP socket write pathsChuck Lever2005-09-231-87/+128
| | | | | | | | | | | | | | | | | | | | | Split the RPC client's main socket write path into a TCP version and a UDP version to eliminate another dependency on the "xprt->stream" variable. Compiler optimization removes unneeded code from xs_sendpages, as this function is now called with some constant arguments. We can now cleanly perform transport protocol-specific return code testing and error recovery in each path. Test-plan: Millions of fsx operations. Performance characterization such as "sio" or "iozone". Examine oprofile results for any changes before and after this patch is applied. Version: Thu, 11 Aug 2005 16:08:46 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: separate TCP and UDP transport connection logicChuck Lever2005-09-231-73/+91
| | | | | | | | | | | | | | Create separate connection worker functions for managing UDP and TCP transport sockets. This eliminates several dependencies on "xprt->stream". Test-plan: Destructive testing (unplugging the network temporarily). Connectathon with v2, v3, and v4. Version: Thu, 11 Aug 2005 16:08:18 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: separate TCP and UDP write space callbacksChuck Lever2005-09-231-31/+53
| | | | | | | | | | | | | | | | Split the socket write space callback function into a TCP version and UDP version, eliminating one dependence on the "xprt->stream" variable. Keep the common pieces of this path in xprt.c so other transports can use it too. Test-plan: Write-intensive workload on a single mount point. Version: Thu, 11 Aug 2005 16:07:51 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: client-side transport switch cleanupChuck Lever2005-09-231-5/+7
| | | | | | | | | | | | | | | Clean-up: change some comments to reflect the realities of the new RPC transport switch mechanism. Get rid of unused xprt_receive() prototype. Also, organize function prototypes in xprt.h by usage and scope. Test-plan: Compile kernel with CONFIG_NFS enabled. Version: Thu, 11 Aug 2005 16:07:21 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: Add helper for waking tasks pending on a transportChuck Lever2005-09-231-5/+2
| | | | | | | | | | | | | | Clean-up: remove only reference to xprt->pending from the socket transport implementation. This makes a cleaner interface for other transport implementations as well. Test-plan: Compile kernel with CONFIG_NFS enabled. Version: Thu, 11 Aug 2005 16:06:52 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: rename the sockstate fieldChuck Lever2005-09-231-4/+2
| | | | | | | | | | | | | Clean-up: get rid of a name reference to sockets in the generic parts of the RPC client by renaming the sockstate field in the rpc_xprt structure. Test-plan: Compile kernel with CONFIG_NFS enabled. Version: Thu, 11 Aug 2005 16:05:53 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: Rename sock_lockChuck Lever2005-09-231-11/+11
| | | | | | | | | | | | | Clean-up: replace a name reference to sockets in the generic parts of the RPC client by renaming sock_lock in the rpc_xprt structure. Test-plan: Compile kernel with CONFIG_NFS enabled. Version: Thu, 11 Aug 2005 16:05:00 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: Reduce stack utilization in xs_sendpagesChuck Lever2005-09-231-30/+43
| | | | | | | | | | | | | | | | Reduce stack utilization of the RPC socket transport's send path. A couple of unlikely()s are added to ensure the compiler places the tail processing at the end of the csect. Test-plan: Millions of fsx operations. Performance characterization such as "sio" or "iozone". Version: Thu, 11 Aug 2005 16:04:30 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: transport switch function namingChuck Lever2005-09-231-226/+238
| | | | | | | | | | | | | | | | | | | Introduce block header comments and a function naming convention to the socket transport implementation. Provide a debug setting for transports that is separate from RPCDBG_XPRT. Eliminate xprt_default_timeout(). Provide block comments for exposed interfaces in xprt.c, and eliminate the useless obvious comments. Convert printk's to dprintk's. Test-plan: Compile kernel with CONFIG_NFS enabled. Version: Thu, 11 Aug 2005 16:04:04 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
* [PATCH] RPC: introduce client-side transport switchChuck Lever2005-09-231-0/+1021
Move the bulk of client-side socket-specific code into a separate source file, net/sunrpc/xprtsock.c. Test-plan: Millions of fsx operations. Performance characterization such as "sio" or "iozone". Destructive testing (unplugging the network temporarily, server reboots). Connectathon with v2, v3, and v4. Version: Thu, 11 Aug 2005 16:03:38 -0400 Signed-off-by: Chuck Lever <cel@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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