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| author | Greg Banks <gnb@melbourne.sgi.com> | 2006-10-04 11:15:49 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-10-04 16:55:16 +0200 |
| commit | fce1456a19f5c08b688c29f00ef90fdfa074c79b (patch) | |
| tree | 789afb4efe2764cabbd65f7d7069acb538711e8b /block/genhd.c | |
| parent | [PATCH] knfsd: Allow max size of NFSd payload to be configured (diff) | |
| download | linux-fce1456a19f5c08b688c29f00ef90fdfa074c79b.tar.xz linux-fce1456a19f5c08b688c29f00ef90fdfa074c79b.zip | |
[PATCH] knfsd: make nfsd readahead params cache SMP-friendly
Make the nfsd read-ahead params cache more SMP-friendly by changing the single
global list and lock into a fixed 16-bucket hashtable with per-bucket locks.
This reduces spinlock contention in nfsd_read() on read-heavy workloads on
multiprocessor servers.
Testing was on a 4 CPU 4 NIC Altix using 4 IRIX clients each doing 1K
streaming reads at full line rate. The server had 128 nfsd threads, which
sizes the RA cache at 256 entries, of which only a handful were used. Flat
profiling shows nfsd_read(), including the inlined nfsd_get_raparms(), taking
10.4% of each CPU. This patch drops the contribution from nfsd() to 1.71% for
each CPU.
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 'block/genhd.c')
0 files changed, 0 insertions, 0 deletions