kernel-fxtec-pro1x/include
Greg Banks 7b2b1fee30 [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 1f1e030bf7

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>
2006-10-04 07:55:16 -07:00
..
acpi
asm-alpha [PATCH] rename the provided execve functions to kernel_execve 2006-10-02 07:57:23 -07:00
asm-arm fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-arm26 fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-avr32 [PATCH] AVR32: Implement kernel_execve 2006-10-02 07:57:24 -07:00
asm-cris [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-frv fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-generic fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-h8300 [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-i386 [PATCH] i383 numa: fix numaq/summit apicid conflict 2006-10-03 18:46:10 -07:00
asm-ia64 [PATCH] sched: introduce child field in sched_domain 2006-10-03 08:04:06 -07:00
asm-m32r fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-m68k fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-m68knommu fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-mips Merge git://git.kernel.org/pub/scm/linux/kernel/git/bunk/trivial 2006-10-03 16:35:11 -07:00
asm-parisc fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-powerpc fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-ppc fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-s390 fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-sh fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-sh64 fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-sparc fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-sparc64 [SPARC64]: Do not include compat.h from asm-sparc64/signal.h any more. 2006-10-02 14:30:45 -07:00
asm-um [PATCH] rename the provided execve functions to kernel_execve 2006-10-02 07:57:23 -07:00
asm-v850 [PATCH] remove remaining errno and __KERNEL_SYSCALLS__ references 2006-10-02 07:57:23 -07:00
asm-x86_64 fix file specification in comments 2006-10-03 23:01:26 +02:00
asm-xtensa fix file specification in comments 2006-10-03 23:01:26 +02:00
crypto
keys
linux [PATCH] knfsd: knfsd: cache ipmap per TCP socket 2006-10-04 07:55:16 -07:00
math-emu
media V4L/DVB (4666): Ensure the WM8775 driver is loaded generically for any board. 2006-10-03 15:13:48 -03:00
mtd Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6 2006-10-01 17:55:53 +01:00
net [PATCH] Add genetlink utilities for payload length calculation 2006-10-01 00:39:29 -07:00
pcmcia
rdma
rxrpc
scsi [PATCH] scsi: device_reprobe() can fail 2006-09-30 19:33:43 -07:00
sound [PATCH] maximum latency tracking: ALSA support 2006-10-01 00:39:19 -07:00
video fix file specification in comments 2006-10-03 23:01:26 +02:00
Kbuild