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From: Peter Staubach <staubach@redhat.com>
To: Wendy Cheng <s_wendy_cheng@hotmail.com>
Cc: nfs@lists.sourceforge.net, wcheng@redhat.com
Subject: Re: [NFS] NFS Digest, Vol 18, Issue 70 (NFS performance problems)
Date: Tue, 20 Nov 2007 16:17:11 -0500	[thread overview]
Message-ID: <47434ED7.4010100@redhat.com> (raw)
In-Reply-To: <BAY104-W43766F661E50E7FFCDA8EBA7F0-MsuGFMq8XAE@public.gmane.org>

Wendy Cheng wrote:
>   
>> top - 15:50:56 up 20 days,  1:33,  9 users,  load average: 3.42, 2.95, 2.38
>>
>> 19200 geo0501   15   0 75076 5224 3480 S    2  0.1   0:07.94 smbd               
>>  2336 root      10  -5     0    0    0 S    1  0.0  57:07.70 kjournald          
>>  2334 root      10  -5     0    0    0 S    1  0.0  33:19.89 kjournald          
>>  2279 root      10  -5     0    0    0 S    0  0.0  15:10.98 md0_raid1          
>>  2283 root      10  -5     0    0    0 S    0  0.0  24:45.79 md1_raid1          
>>  3935 root      15   0     0    0    0 S    0  0.0  14:04.25 nfsd               
>>  3943 root      15   0     0    0    0 S    0  0.0  14:18.43 nfsd               
>>  3947 root      15   0     0    0    0 S    0  0.0  13:57.06 nfsd               
>>  8325 ed0127    15   0 75044 4812 3264 S    0  0.1   0:01.29 smbd            
>>     
>
> Intuitively (based on ext3's journal threads info above) I would suspect this is due to the change of the export default option from "async" to "sync" between 2.6.9 and 2.6.18 kernels.  So go to your /etc/exports file and explicitly set the export option to "async" to see whether you can get the performance back.
>
> e.g. changes "/server *(rw)" to "/server *(async, rw)".

While this may or may not restore your performance aspects, it
is not safe to make this change.  The change was made for a
reason.

Please any and all other possibilities before making this change.
It is not free.

    Thanx...

       ps

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  parent reply	other threads:[~2007-11-20 21:17 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <mailman.194659.1195581701.26582.nfs@lists.sourceforge.net>
2007-11-20 20:22 ` [NFS] NFS Digest, Vol 18, Issue 70 (NFS performance problems) Wendy Cheng
     [not found]   ` <BAY104-W43766F661E50E7FFCDA8EBA7F0-MsuGFMq8XAE@public.gmane.org>
2007-11-20 21:17     ` Peter Staubach [this message]
2007-11-20 21:23       ` Wendy Cheng
2007-11-21 16:04         ` Chuck Lever
2007-11-26  3:28           ` Wendy Cheng
2007-11-26  4:41             ` Trond Myklebust
2007-11-26  5:02             ` J. Bruce Fields
     [not found]               ` <18254.19187.470275.538680@notabene.brown>
     [not found]                 ` <18254.19187.470275.538680-wvvUuzkyo1EYVZTmpyfIwg@public.gmane.org>
2007-11-29  5:30                   ` Trond Myklebust
     [not found]                     ` <1196314230.7950.42.camel-rJ7iovZKK19ZJLDQqaL3InhyD016LWXt@public.gmane.org>
2007-11-30 16:27                       ` Wendy Cheng
2007-12-03 20:31                         ` J. Bruce Fields
2007-12-03 21:13                           ` Wendy Cheng
2007-12-03 21:30                             ` J. Bruce Fields
2007-12-03 21:38                               ` J. Bruce Fields
2007-12-03 21:49                               ` Wendy Cheng
2007-12-03 22:07                                 ` J. Bruce Fields
2007-11-27 18:40           ` Rui Pedro Mendes Salgueiro
     [not found]             ` <20071127184050.GA13791-/uZbGGhPd8Gmv2Aub4FSgw@public.gmane.org>
2007-11-28  1:50               ` Chuck Lever

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