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Re: [Xen-devel] SMP dom0 and AMD64? + some benchmark figures

To: Paul Larson <plars@xxxxxxxxxxxxxxxxx>

From: Nicholas Lee <emptysands@xxxxxxxxx>

Date: Fri, 7 Oct 2005 12:03:41 +1300

Cc: Ian Pratt <m+Ian.Pratt@xxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>

Delivery-date: Thu, 06 Oct 2005 23:01:09 +0000

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On 10/7/05, Paul Larson <plars@xxxxxxxxxxxxxxxxx> wrote: > Ian Pratt wrote: > >SMP dom0 should work fine, but non-SMP is more stable. Right. Once Xen gets to 3.0.5+ or similar will there be a recommended config? How does the performance profile work with SMP and the interaction between domU and dom0 for CPU bound I/O? Are the CPU slices allocated independantly for each CPU in SMP domains? > Since we're supposed to be flushing out bugs, could we consider changing > this to default to SMP dom0 to help get more exposure here? I should be able to test out my NX based desktop over the weekend. Of quick interest might be one of the benchmarks I use: nic@wuwei:~/sys/ufc$ ./speedf # 32bit Debian/Sarge 2.4.26-1-386 Running UFC-crypt for 100 seconds of virtual time ... Did 153237.030000 fcrypt()s per second. nic@wuwei:~/sys/speedf/ufc$ ./speedf # 64bit Debian/Sarge 2.6.8-11-amd64-generic Running UFC-crypt for 100 seconds of virtual time ... Did 300135.843750 fcrypt()s per second. nic@wuwei:~/sys/speedf/ufc$ ./speedf # 2.6.12-xen0 #3 SMP Running UFC-crypt for 100 seconds of virtual time ... Did 293966.906250 fcrypt()s per second. speedf is pretty much a single processor testing, but Xen 3.0 holds up well only dropping 2%. I don't have 2.0 figures yet, and I'll get some domU figures later this weekend. -- Nicholas Lee http://stateless.geek.nz gpg 8072 4F86 EDCD 4FC1 18EF 5BDD 07B0 9597 6D58 D70C _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel

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