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

[Jakob Oestergaard <jakob@unthought.net>]

On Fri, Mar 31, 2006 at 09:21:29AM -0500, Trond Myklebust wrote:
...
> 
> Hmm... Nothing obvious.

Ok.

I'm wondering... Can anyone else reproduce this problem?

Just to explain quickly:
 Running nfsbench (on the NFS client) once with LEADING_EMPTY_SPACE set
 to 0 and then once with the option set to 1.  If there's a big change
 in wall-clock execution time, this indicates that the problem exists.

I'd be really interested in knowing whether I'm the only one who sees
this problem.

> Try catting /proc/self/mountstats and see if the entry for your NFS
> mount shows anything interesting.

mountstats doesn't exist on 2.6.15.7 so I can't really compare...

I wonder if any of the following is 'interesting'  :)

device sparrow:/exported/joe mounted on /u/joe with fstype nfs statvers=1.0
 opts: rw,vers=3,rsize=32768,wsize=32768,acregmin=3,acregmax=60,acdirmin=30,
       acdirmax=60,hard,intr,proto=udp,timeo=7,retrans=3
 age:    274
 caps:   caps=0x1,wtmult=4096,dtsize=4096,bsize=0,namelen=255
 sec:    flavor=1
 events: 175 77 3 3 14 15 108 4 0 7 0 4 0 1 2 0 0 14 0 1 4 0 0 0 0 
 bytes:  194733 11746 0 0 37748 15340 13 0 
 RPC iostats version: 1.0  p/v: 100003/3 (nfs)
 xprt:   udp 1023 0 74 74 0 74 0
 per-op statistics
 ... then follows the nfsstat numbers as far as I can see ...

Does the above tell you anything?

-- 

 / jakob