Date: Fri, 30 Dec 2011 11:01:17 -0800 From: Sean Bruno <seanbru@yahoo-inc.com> To: Alan Cox <alc@rice.edu> Cc: Alan Cox <alc@cs.rice.edu>, "xen@freebsd.org" <xen@freebsd.org> Subject: Re: PV i386 patch Message-ID: <1325271677.17645.18.camel@hitfishpass-lx.corp.yahoo.com> In-Reply-To: <4EFCEF2D.4080007@rice.edu> References: <4EEB9CCE.6090701@rice.edu> <1324169806.3093.3.camel@hitfishpass-lx.corp.yahoo.com> <4EED4982.3080208@freebsd.org> <1324339762.3093.14.camel@hitfishpass-lx.corp.yahoo.com> <4EF04F3C.9010309@rice.edu> <1324387685.3093.28.camel@hitfishpass-lx.corp.yahoo.com> <4EF0D8D7.2060503@rice.edu> <4EF0EC1A.4010604@freebsd.org> <1324412718.12783.10.camel@hitfishpass-lx.corp.yahoo.com> <4EF245D1.2050503@rice.edu> <1324679157.17645.6.camel@hitfishpass-lx.corp.yahoo.com> <4EFA0313.6030105@rice.edu> <1325028241.17645.10.camel@hitfishpass-lx.corp.yahoo.com> <4EFCCC06.4020001@rice.edu> <1325197722.17645.14.camel@hitfishpass-lx.corp.yahoo.com> <4EFCEF2D.4080007@rice.edu>
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On Thu, 2011-12-29 at 14:52 -0800, Alan Cox wrote: > On 12/29/2011 16:28, Sean Bruno wrote: > > On Thu, 2011-12-29 at 12:22 -0800, Alan Cox wrote: > >> Please try this patch. It eliminates a race condition that might > >> actually account for some of the crashes in FreeBSD>= 9 on Xen. > >> > >> Alan > >> > > ref10-xen32.freebsd.org has this applied now. Looks ok to me? > > > > > I know that lmbench's bw_pipe program exercises the code path that I > changed if you want to give it a bit more testing. > > Alan > Ok, I ran "a thing" ... I have a lot of poking around to do in lmbench now. Thanks for pointing me at this. Cursory run with patch "xen-pmap.c" [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe Pipe bandwidth: 892.52 MB/sec [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe -N 5 Pipe bandwidth: 982.46 MB/sec [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe -N 5 -P 2 Pipe bandwidth: 899.34 MB/sec Cursory run of vanilla-current: [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe Pipe bandwidth: 984.37 MB/sec [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe -N 5 Pipe bandwidth: 977.54 MB/sec [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ ./bw_pipe -N 5 -P 2 Pipe bandwidth: 887.26 MB/sec [sbruno@ref10-xen32 /usr/local/lib/lmbench/bin/i386-freebsd10.0]$ uname -a FreeBSD ref10-xen32.freebsd.org 10.0-CURRENT FreeBSD 10.0-CURRENT #1 r228971: Fri Dec 30 18:27:01 UTC 2011 sbruno@ref10-xen32.freebsd.org:/var/tmp/dumpster/scratch/sbruno-scratch/head/sys/XEN i386
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