nfs slowdown (RELENG_8)

[Mike Tancsa]

On 6/23/2014 6:41 PM, Rick Macklem wrote:
>>
> I suggest you try disabling TSO on the nics (or setting wsize=32786
> on all mounts). Usually such slowdowns are related to the underlying
> network fabric and there are known TSO issues for nics/drivers that
> only handle 32 transmit buffers when 64K writes are being used.

Thanks Rick,
	I tried that. Both doing ifconfig em1 -tso and set net.inet.tcp.tso to 
0.  No impact on these particular boxes.  Mount is done


/sbin/mount_nfs -o tcp,rsize=32768,wsize=32768,async

I looked at the tcpdump between the working and non working servers and 
they look identical.  Tried changing switch ports and the problem does 
not follow the port, only the server.

	---Mike

-- 
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Mike Tancsa, tel +1 519 651 3400
Sentex Communications, mike at sentex.net
Providing Internet services since 1994 www.sentex.net
Cambridge, Ontario Canada   http://www.tancsa.com/