[lug] Horrid NFS performance on linux

[Jack Swope]

Physical file server with most testing being done by VM.  Although test
results have been confirmed by physical test machines. We weren't seeing
ony load on the CPUs  or heavy IO on the disk or loading on the NICs.  The
traffic seemed to be missing each other.  With async on the CPU load
increases as I would expect it to, the iostat increase and everything runs
fine.

Jack


On Thu, Apr 18, 2013 at 3:19 PM, Chris McDermott <csmcdermott at gmail.com>wrote:

> Are these physical hosts or virtual? What level of context switching and
> interrupts are you seeing?
>
>
> On Thu, Apr 18, 2013 at 12:08 PM, Orion Poplawski <orion at cora.nwra.com>wrote:
>
>> On 04/18/2013 12:01 PM, Jack Swope wrote:
>> > /etc/exports
>> > /raid/share     -mp=/raid/share xxx.xxx.xxx.0/24(rw,insecure)
>> yyy.yyy.yyy.0/24(rw)
>> >
>> > /proc/fs/nfsd/exports
>> > /raid/share     *,xxx.xxx.xxx.0/24,hostname.here.edu
>> > <http://hostname.here.edu
>> >(rw,insecure,root_squash,sync,wdelay,no_subtree_check,uuid=2da6585e:8e224e71:905ee5f8:518a5d00)
>> > /raid/share
>> >
>> *,yyy.yyy.yyy.0/24(rw,root_squash,sync,wdelay,no_subtree_check,uuid=2da6585e:8e224e71:905ee5f8:518a5d00)
>> >
>> > async is not set.
>>
>> Set it.  Although I suspect that is not your only issue.  Even 25MB/s is
>> terrible.
>>
>>
>> --
>> Orion Poplawski
>> Technical Manager                     303-415-9701 x222
>> NWRA, Boulder/CoRA Office             FAX: 303-415-9702
>> 3380 Mitchell Lane                       orion at nwra.com
>> Boulder, CO 80301                   http://www.nwra.com
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>
>
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