[CentOS] NFS performance - default rsize

[Alex Still]

On Tue, Jun 22, 2010 at 6:16 PM, JohnS <jses27 at gmail.com> wrote:
>
> On Tue, 2010-06-22 at 17:44 +0200, Alex Still wrote:
>
>>
>> Clients are blade servers. The blade chassis have integrated cisco
>> switches, which are plugged to a cisco 6509. The NFS server is on
>> another site 40km away, directly connected to another 6509.  These
>> datacenters are linked via DWDM.
>> Latency between a client and the NFS server is about half a
>> millisecond. Jumbo frames are enabled.
>>
>> Blades have 1 Gb link
>> The NFS server has multiple 1Gb links, used for different shares
>> Neither are close to full utilization, maybe 100Mb/s of traffic and 20
>> 000 paquets/s at the server end
> ---
> http://www.google.com/search?hl=en&client=firefox-a&hs=qKR&rls=org.mozilla%3Aen-US%3Aofficial&q=cisco+6509+nfs+problems&aq=f&aqi=&aql=&oq=&gs_rfai=
>
> Your not the only one with the prob..

Not sure it has to do with the 6509, we're doing TCP, and the IOS is up to date.
Also as mentionned an older distribution/kernel on the same hardware
will not have the problem.
If all else fails I'll see if we can run tests with a crossover cable.. :-)