Re: [NFS] NFS Digest, Vol 18, Issue 70 (NFS performance problems)

[Wendy Cheng <wcheng@redhat.com>]

Peter Staubach wrote:
> 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.
Not to start a flame war :) but please read his email. His *old* system, 
that uses "async" option", has been running fine for several years. Why 
all of sudden, an "async" option is such a big issue ?

-- Wendy
>
> Please any and all other possibilities before making this change.
> It is not free.
>
>    Thanx...
>
>       ps


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