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From: Wei Huang <wei.huang2@amd.com>
To: "'xen-devel@lists.xensource.com'" <xen-devel@lists.xensource.com>,
	Keir Fraser <keir.xen@gmail.com>,
	george.dunlap@eu.citrix.com, Jan Beulich <JBeulich@novell.com>
Subject: [PATCH][RFC][0/2] x86 SMP: enables core-pair topology detection for AMD CPUs
Date: Thu, 23 Jun 2011 17:51:50 -0500	[thread overview]
Message-ID: <4E03C386.9030009@amd.com> (raw)

Hi,

The following two patches enable core-pair topology detection for AMD 
CPUs. The main idea is to record compute unit information into 
cpuinfo_x86 and use it when building sibling map. The sibling map will 
be used by Xen credit scheduler to coordinate VCPU scheduling in a 
fashion similar to SMT. This code is very similar to upstream Linux kernel.

Regarding the performance improvement, I saw ~8% improvement running 
kernel compilation on Dom0 with this patch. Anrea Przywara ran a POVRay 
benchmark using this patch and he saw ~5% improvement. No perf 
degradation was seen so far.

Please review.

Thanks,
-Wei

             reply	other threads:[~2011-06-23 22:51 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-06-23 22:51 Wei Huang [this message]
2011-06-27  8:58 ` [PATCH][RFC][0/2] x86 SMP: enables core-pair topology detection for AMD CPUs Jan Beulich
2011-06-27 17:26   ` Wei Huang
2011-06-28  7:38     ` Jan Beulich
2011-06-28  8:51     ` George Dunlap
2011-10-21 10:31     ` George Dunlap

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