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[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 10/22/2012 03:59 PM, Tim Deegan wrote: > At 19:21 +0200 on 20 Oct (1350760876), Peter Maloney wrote: >> I ran a bisect to find out when Windows XP 32 bit becomes unusably slow. >> And I found the changeset that caused it. >> >> ========== >> The problem: >> ========== >> >> Windows 8 64 bit and 32 bit run fast and fine in the newest xen versions. >> >> Windows XP 32 bit runs unusably slow in anything new that I built from >> xen-unstable, but runs fast in 4.1.2 and 4.1.3 stable. While it is >> running slow, "xm top" or "xl top" show cpu usage around 650% for the domu. >> >> The bug might be AMD specific. I'm running an AMD FX-8150. > The bug does seem to be AMD-specific, and NPT-specific; with > 'hap=0' it goes much faster. K. glad to hear it ;) I just guessed it was AMD specific since not so many of us seem to run AMDs and it seemed to be only me with the problem. >> ========== >> The result: >> ========== >> >> good: 24769:730f6ed72d70 >> bad: 24770:7f79475d3de7 >> >> 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 > This change was bad for performnace across the board and most of it has > since been either reverted or amended, but clearly we missed something > here. > > It's interesting that Win8 isn't slowed down. I wonder whether that's to > do with the way it drives the VGA card -- IIRC it uses a generic VESA > driver rather than a Cirrus one. My tests included - passthrough and "stdvga=1" which replaces the cirrus one with some other card. - no passthrougn, and did not set stdvga (used vnc and cirrus) Both were slow. > > Tim. > > > _______________________________________________ > Xen-devel mailing list > Xen-devel@xxxxxxxxxxxxx > http://lists.xen.org/xen-devel _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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