[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] xen-unstable, winxp32 very poor performance on AMD FX-8150, I bisected and changeset is 24770:7f79475d3de7
On 11/13/2012 02:17 PM, Peter Maloney wrote: > On 2012-11-01 18:28, Andres Lagar-Cavilla wrote: >> On Nov 1, 2012, at 1:00 PM, Tim Deegan <tim@xxxxxxx> wrote: >> >>> Hi, >>> >>> At 14:59 +0100 on 22 Oct (1350917960), Tim Deegan wrote: >>>> At 19:21 +0200 on 20 Oct (1350760876), Peter Maloney wrote: >>>>> The change was 8 months ago >>>>> >>>>> changeset: 24770:7f79475d3de7 >>>>> user: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx> >>>>> date: Fri Feb 10 16:07:07 2012 +0000 >>>>> summary: x86/mm: Make p2m lookups fully synchronized wrt modifications >>> [...] >> Not any immediate ideas without profiling. >> >> However, most callers of hvmemul_do_io pass a stub zero ram_gpa address. We >> might be madly hitting the p2m locks for no reason there. >> >> How about the following patch, Peter, Tim? > I tried the patch applied to xen-unstable 4.2.0-branched 528f0708b6db+ 4.2.0-branched It seemed the same. It was extremely slow with 7 vcpus, and with 2 vcpus it was slow, but fast enough that I could bother to log in and out during the test. Attached are logs generated with this command (using xm instead of xl): for i in {1..30}; do xm debug-keys d; xm dmesg -c; done >> nameoflog xenxp_xm_dmesg_-c_7cpus_idle.log xenxp_xm_dmesg_-c_7cpus_logintooslow.log xenxp_xm_dmesg_-c_7cpus_shutdown.log xenxp_xm_dmesg_-c_duringlogin.log xenxp_xm_dmesg_-c_idling_login_screen.log Also there is xenxp_dmesg.log which is output from hitting alt+sysrq+w and p in case it's relevant. BTW this time I am testing with kernel 3.6.7 Attachment:
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