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authorJ. Bruce Fields <bfields@citi.umich.edu>2009-05-27 18:51:06 -0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2009-05-27 18:51:06 -0400
commit7f4218354fe312b327af06c3d8c95ed5f214c8ca (patch)
tree545cd2ae14e2e4329f2bf1b5248079197d0a914c /net/sunrpc/svcsock.c
parenta0d24b295aed7a9daf4ca36bd4784e4d40f82303 (diff)
nfsd: Revert "svcrpc: take advantage of tcp autotuning"
This reverts commit 47a14ef1af48c696b214ac168f056ddc79793d0e "svcrpc: take advantage of tcp autotuning", which uncovered some further problems in the server rpc code, causing significant performance regressions in common cases. We will likely reinstate this patch after releasing 2.6.30 and applying some work on the underlying fixes to the problem (developed by Trond). Reported-by: Jeff Moyer <jmoyer@redhat.com> Cc: Olga Kornievskaia <aglo@citi.umich.edu> Cc: Jim Rees <rees@umich.edu> Cc: Trond Myklebust <trond.myklebust@fys.uio.no> Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'net/sunrpc/svcsock.c')
-rw-r--r--net/sunrpc/svcsock.c35
1 files changed, 28 insertions, 7 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index af3198814c1..9d504234af4 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -345,6 +345,7 @@ static void svc_sock_setbufsize(struct socket *sock, unsigned int snd,
345 lock_sock(sock->sk); 345 lock_sock(sock->sk);
346 sock->sk->sk_sndbuf = snd * 2; 346 sock->sk->sk_sndbuf = snd * 2;
347 sock->sk->sk_rcvbuf = rcv * 2; 347 sock->sk->sk_rcvbuf = rcv * 2;
348 sock->sk->sk_userlocks |= SOCK_SNDBUF_LOCK|SOCK_RCVBUF_LOCK;
348 release_sock(sock->sk); 349 release_sock(sock->sk);
349#endif 350#endif
350} 351}
@@ -796,6 +797,23 @@ static int svc_tcp_recvfrom(struct svc_rqst *rqstp)
796 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags), 797 test_bit(XPT_CONN, &svsk->sk_xprt.xpt_flags),
797 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags)); 798 test_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags));
798 799
800 if (test_and_clear_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags))
801 /* sndbuf needs to have room for one request
802 * per thread, otherwise we can stall even when the
803 * network isn't a bottleneck.
804 *
805 * We count all threads rather than threads in a
806 * particular pool, which provides an upper bound
807 * on the number of threads which will access the socket.
808 *
809 * rcvbuf just needs to be able to hold a few requests.
810 * Normally they will be removed from the queue
811 * as soon a a complete request arrives.
812 */
813 svc_sock_setbufsize(svsk->sk_sock,
814 (serv->sv_nrthreads+3) * serv->sv_max_mesg,
815 3 * serv->sv_max_mesg);
816
799 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 817 clear_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
800 818
801 /* Receive data. If we haven't got the record length yet, get 819 /* Receive data. If we haven't got the record length yet, get
@@ -1043,6 +1061,15 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
1043 1061
1044 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF; 1062 tcp_sk(sk)->nonagle |= TCP_NAGLE_OFF;
1045 1063
1064 /* initialise setting must have enough space to
1065 * receive and respond to one request.
1066 * svc_tcp_recvfrom will re-adjust if necessary
1067 */
1068 svc_sock_setbufsize(svsk->sk_sock,
1069 3 * svsk->sk_xprt.xpt_server->sv_max_mesg,
1070 3 * svsk->sk_xprt.xpt_server->sv_max_mesg);
1071
1072 set_bit(XPT_CHNGBUF, &svsk->sk_xprt.xpt_flags);
1046 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags); 1073 set_bit(XPT_DATA, &svsk->sk_xprt.xpt_flags);
1047 if (sk->sk_state != TCP_ESTABLISHED) 1074 if (sk->sk_state != TCP_ESTABLISHED)
1048 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags); 1075 set_bit(XPT_CLOSE, &svsk->sk_xprt.xpt_flags);
@@ -1112,14 +1139,8 @@ static struct svc_sock *svc_setup_socket(struct svc_serv *serv,
1112 /* Initialize the socket */ 1139 /* Initialize the socket */
1113 if (sock->type == SOCK_DGRAM) 1140 if (sock->type == SOCK_DGRAM)
1114 svc_udp_init(svsk, serv); 1141 svc_udp_init(svsk, serv);
1115 else { 1142 else
1116 /* initialise setting must have enough space to
1117 * receive and respond to one request.
1118 */
1119 svc_sock_setbufsize(svsk->sk_sock, 4 * serv->sv_max_mesg,
1120 4 * serv->sv_max_mesg);
1121 svc_tcp_init(svsk, serv); 1143 svc_tcp_init(svsk, serv);
1122 }
1123 1144
1124 dprintk("svc: svc_setup_socket created %p (inet %p)\n", 1145 dprintk("svc: svc_setup_socket created %p (inet %p)\n",
1125 svsk, svsk->sk_sk); 1146 svsk, svsk->sk_sk);