Date: Mon, 14 Feb 2011 12:10:12 GMT From: Alex <joovke@joovke.com> To: freebsd-xen@FreeBSD.org Subject: Re: kern/154428: xn0 network interface and PF - Massive performance drop Message-ID: <201102141210.p1ECAC6L046451@freefall.freebsd.org>
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The following reply was made to PR kern/154428; it has been noted by GNATS. From: Alex <joovke@joovke.com> To: Cc: freebsd-xen@freebsd.org, bug-followup@freebsd.org Subject: Re: kern/154428: xn0 network interface and PF - Massive performance drop Date: Mon, 14 Feb 2011 23:07:29 +1100 I stumbled across PR 135178, perhaps there is some relationship with these PR's, though the reporter of that PR has not responded in some time. On 02/13/11 15:31, Colin Percival wrote: > On 02/12/11 20:18, Alex wrote: >> Fixed by net.inet.tcp.tso: 1 -> 0 >> >> but why?? found this by trial an error. setting net.inet.tcp.tso to 0 >> with pf enabled gives good performance, if i set it to 1, speeds plumet >> to below dialup! > There have been problems with Xen and TSO in the past relating to how much > data gets handed off to the hypervisor at once... why this would cause issues > only with PF, I have no idea, though. >
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