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</o:shapelayout></xml><![endif]--></head><body lang=EL link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span lang=EN-US>Hi all,<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>I am trying to run some performance tests using libvirt 1.2.17. For these tests it is necessary to set a specific affinity for the VCPUs of a running VM.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US>The problem is, that I noticed a significant performance drop in my metrics when using ‘vcpupin’ from the virsh console instead of running ‘taskset’ natively.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Specifically the methods I am comparing are<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Using native shell<o:p></o:p></span></p><p class=MsoNormal style='margin-left:36.0pt'><span lang=EN-US>taskset –a –cp $MY_CPUSET $MY_DOMAIN_PID <o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo3'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Using virsh console (performance ~30% down)<o:p></o:p></span></p><p class=MsoListParagraph><span lang=EN-US>for all $VCPUs<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:36.0pt'><span lang=EN-US>virsh vcpupin my_domain –cpulist $MY_CPUSET –vcpu $VCPU –live<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> virsh emulatorpin my_domain –cpulist $MY_CPUSET –live<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>It seems that the usage of ‘vcpupin’ causes a performance drop even if it is run alongside ‘taskset’ on the same $CPU_SET<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Functionally everything seems to be working when I check the ‘/proc/’ filesystem<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US> cat /proc/MY_DOMAIN_PID/*/status | grep Cpus_allowed_list<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>My questions are:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>1.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Has anybody else noticed this?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>2.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Is this expected based on the implementation details?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>3.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Is this a bug that is fixed in a newer libvirt version?<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l2 level1 lfo1'><![if !supportLists]><span lang=EN-US><span style='mso-list:Ignore'>4.<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-US>Is there a solution to this issue?<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US>Thanks,<o:p></o:p></span></p><table class=MsoNormalTable border=0 cellspacing=0 cellpadding=0 style='background:white;border-collapse:collapse'><tr><td colspan=2 style='padding:0cm 0cm 6.0pt 0cm'><p class=MsoNormal><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:9.0pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'>George Paraskevopoulos</span><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'> </span><span lang=EN-US style='mso-fareast-language:EL'><o:p></o:p></span></p><p class=MsoNormal><span lang=EN-US style='font-size:8.5pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'>Software Engineer (SDN/NFV)</span><span lang=EN-US style='font-size:10.0pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'>, </span><span lang=EN-US style='font-size:8.5pt;font-family:Consolas;color:#4F81A2;mso-fareast-language:EL'>INTRACOM-TELECOM</span><span lang=EN-US><o:p></o:p></span></p></td></tr><tr><td valign=top style='padding:0cm 9.0pt 0cm 0cm'><p class=MsoNormal><span 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