Re: NFS client (10x) performance regression 2.6.14.7 -> 2.6.15

From: Jakob Oestergaard
Date: Fri Mar 31 2006 - 07:42:17 EST


On Fri, Mar 31, 2006 at 07:22:50AM -0500, Trond Myklebust wrote:
...
>
> Some nfsstat output comparing the good and bad cases would help.

Clean boot on 2.6.15 and 2.6.14.7, one run of nfsbench with
LEADING_EMPTY_SPACE=1. I've skipped the NFS v2 stats because they're
all 0.

--- Run on bad kernel ---

[puffin:joe] $ uname -a
Linux puffin 2.6.15 #1 SMP Fri Mar 31 11:10:28 CEST 2006 i686 GNU/Linux
[puffin:joe] $ nfsstat
Client rpc stats:
calls retrans authrefrsh
63 0 0

<snip v2 stats>

Client nfs v3:
null getattr setattr lookup access readlink
0 0% 11 18% 0 0% 26 42% 14 22% 0 0%
read write create mkdir symlink mknod
4 6% 0 0% 0 0% 0 0% 0 0% 0 0%
remove rmdir rename link readdir readdirplus
0 0% 0 0% 0 0% 0 0% 0 0% 4 6%
fsstat fsinfo pathconf commit
0 0% 2 3% 0 0% 0 0%
[puffin:joe] $ time ./nfsbench

real 0m29.242s
user 0m0.000s
sys 0m0.160s
[puffin:joe] $ nfsstat
Client rpc stats:
calls retrans authrefrsh
13240 0 0

<snip v2 stats>

Client nfs v3:
null getattr setattr lookup access readlink
0 0% 2583 19% 0 0% 30 0% 24 0% 0 0%
read write create mkdir symlink mknod
7045 53% 3200 24% 1 0% 0 0% 0 0% 0 0%
remove rmdir rename link readdir readdirplus
0 0% 0 0% 0 0% 0 0% 0 0% 34 0%
fsstat fsinfo pathconf commit
0 0% 2 0% 0 0% 319 2%

[puffin:joe] $

--- Run on good kernel ---

[puffin:joe] $ uname -a
Linux puffin 2.6.14.7 #1 SMP Fri Mar 31 10:41:59 CEST 2006 i686
GNU/Linux
[puffin:joe] $ nfsstat
Client rpc stats:
calls retrans authrefrsh
52 0 0

<snip v2 stats>

Client nfs v3:
null getattr setattr lookup access readlink
0 0% 7 14% 0 0% 24 48% 13 26% 0 0%
read write create mkdir symlink mknod
4 8% 0 0% 0 0% 0 0% 0 0% 0 0%
remove rmdir rename link readdir readdirplus
0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
fsstat fsinfo pathconf commit
0 0% 2 4% 0 0% 0 0%

[puffin:joe] $ time ./nfsbench

real 0m0.224s
user 0m0.000s
sys 0m0.072s
[puffin:joe] $ nfsstat
Client rpc stats:
calls retrans authrefrsh
384 0 0

<snip v2 stats>

Client nfs v3:
null getattr setattr lookup access readlink
0 0% 10 2% 1 0% 26 6% 15 3% 0 0%
read write create mkdir symlink mknod
6 1% 321 84% 0 0% 0 0% 0 0% 0 0%
remove rmdir rename link readdir readdirplus
0 0% 0 0% 0 0% 0 0% 0 0% 0 0%
fsstat fsinfo pathconf commit
0 0% 2 0% 0 0% 1 0%

[puffin:joe] $


--

/ jakob

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