Re: Strange delays on NFS server

[Ian Thurlbeck <ian@stams.strath.ac.uk>]

Steve Dickson wrote:
> 
> 
> Ian Thurlbeck wrote:
> 
>>   PID USER PRI  NI  SIZE  RSS SHARE STAT %CPU %MEM   TIME CPU COMMAND
>>  6365 root  16   0  1244 1244   880 R     0.9  0.2   0:15   0 top
>>   156 root  15   0     0    0     0 DW    0.0  0.0  25:45   0 kjournald
>>  2021 root  15   0     0    0     0 DW    0.0  0.0  17:38   0 nfsd
>>  2037 root  15   0     0    0     0 DW    0.0  0.0  17:51   0 nfsd
>>  2042 root  15   0     0    0     0 DW    0.0  0.0  17:07   0 nfsd
>>  2044 root  15   0     0    0     0 DW    0.0  0.0  16:44   0 nfsd
>>
>> And then the bdflush process joins in and the number of nfsd processes
>> grows, then shrinks back, and finally they all disappear.
>>
> Hmm... this is kinda what I expected... nfsd is waiting on the local 
> filesystem....
> Would it be nice if nfsd would know how to speak aio...  but  back to 
> reality.....
> What happens if you double/triple (assuming you have enough memory)  the 
> number nfsd
> that are started? does it help or hurt? My guess is it probably will not 
> make a difference

I bumped the nfsd's up to 64 (from 32) and subjectively the problem gets 
worse.  I then reduced them to 16 and things are a bit better...

Would changing some of the bdflush settings help at all?

Thanks

Ian
-- 
Ian Thurlbeck                http://www.stams.strath.ac.uk/
Statistics and Modelling Science, University of Strathclyde
Livingstone Tower, 26 Richmond Street, Glasgow, UK,  G1 1XH
Tel: +44 (0)141 548 3667           Fax: +44 (0)141 552 2079



-------------------------------------------------------
SF.Net email is sponsored by Shop4tech.com-Lowest price on Blank Media
100pk Sonic DVD-R 4x for only $29 -100pk Sonic DVD+R for only $33
Save 50% off Retail on Ink & Toner - Free Shipping and Free Gift.
http://www.shop4tech.com/z/Inkjet_Cartridges/9_108_r285
_______________________________________________
NFS maillist  -  NFS@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/nfs