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authorGreg Banks <gnb@melbourne.sgi.com>2006-10-04 05:15:50 -0400
committerLinus Torvalds <torvalds@g5.osdl.org>2006-10-04 10:55:16 -0400
commit7b2b1fee30df7e2165525cd03f7d1d01a3a56794 (patch)
tree71740fb9ea88465b54c52d998eadd012a6f8f4a6 /net/sunrpc/svcsock.c
parentfce1456a19f5c08b688c29f00ef90fdfa074c79b (diff)
[PATCH] knfsd: knfsd: cache ipmap per TCP socket
Speed up high call-rate workloads by caching the struct ip_map for the peer on the connected struct svc_sock instead of looking it up in the ip_map cache hashtable on every call. This helps workloads using AUTH_SYS authentication over TCP. Testing was on a 4 CPU 4 NIC Altix using 4 IRIX clients, each with 16 synthetic client threads simulating an rsync (i.e. recursive directory listing) workload reading from an i386 RH9 install image (161480 regular files in 10841 directories) on the server. That tree is small enough to fill in the server's RAM so no disk traffic was involved. This setup gives a sustained call rate in excess of 60000 calls/sec before being CPU-bound on the server. Profiling showed strcmp(), called from ip_map_match(), was taking 4.8% of each CPU, and ip_map_lookup() was taking 2.9%. This patch drops both contribution into the profile noise. Note that the above result overstates this value of this patch for most workloads. The synthetic clients are all using separate IP addresses, so there are 64 entries in the ip_map cache hash. Because the kernel measured contained the bug fixed in commit commit 1f1e030bf75774b6a283518e1534d598e14147d4 and was running on 64bit little-endian machine, probably all of those 64 entries were on a single chain, thus increasing the cost of ip_map_lookup(). With a modern kernel you would need more clients to see the same amount of performance improvement. This patch has helped to scale knfsd to handle a deployment with 2000 NFS clients. Signed-off-by: Greg Banks <gnb@melbourne.sgi.com> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net/sunrpc/svcsock.c')
-rw-r--r--net/sunrpc/svcsock.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 1d512337ccd9..b39e7e2b648f 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -1610,6 +1610,8 @@ svc_delete_socket(struct svc_sock *svsk)
1610 sockfd_put(svsk->sk_sock); 1610 sockfd_put(svsk->sk_sock);
1611 else 1611 else
1612 sock_release(svsk->sk_sock); 1612 sock_release(svsk->sk_sock);
1613 if (svsk->sk_info_authunix != NULL)
1614 svcauth_unix_info_release(svsk->sk_info_authunix);
1613 kfree(svsk); 1615 kfree(svsk);
1614 } else { 1616 } else {
1615 spin_unlock_bh(&serv->sv_lock); 1617 spin_unlock_bh(&serv->sv_lock);