Date: Tue, 24 Jun 2014 09:10:41 -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: <53A978D1.2000207@sentex.net> In-Reply-To: <2091718059.2982836.1403563319620.JavaMail.root@uoguelph.ca> References: <2091718059.2982836.1403563319620.JavaMail.root@uoguelph.ca>
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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 -- ------------------- 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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