Date: Tue, 24 Jun 2014 10:14:06 -0400 From: Mike Tancsa <mike@sentex.net> To: Rick Macklem <rmacklem@uoguelph.ca> Cc: FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org> Subject: Re: nfs slowdown (RELENG_8) Message-ID: <53A987AE.8060708@sentex.net> In-Reply-To: <53A978D1.2000207@sentex.net> References: <2091718059.2982836.1403563319620.JavaMail.root@uoguelph.ca> <53A978D1.2000207@sentex.net>
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On 6/24/2014 9:10 AM, Mike Tancsa wrote: > 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. I also just tried with an igb nic and the same issue. These are i386 boxes. I wonder if its something to do with that. (non PAE kernel) ---Mike -- ------------------- Mike Tancsa, tel +1 519 651 3400 Sentex Communications, mike@sentex.net Providing Internet services since 1994 www.sentex.net Cambridge, Ontario Canada http://www.tancsa.com/
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