RE: [Xen-ia64-devel] kernel build performance data with dom0_VP modeopen

["Magenheimer, Dan (HP Labs Fort Collins)" <dan.magenheimer@xxxxxx>]

At first, I suspected that this degradation was entirely
due to the fact that large (64MB?) kernel pages were
now causing many more TLB/VHPT misses because they are
fragmented into 16KB pages.  However, I am
seeing that domU performance is also reduced by ~3%,
and domU had this fragmentation prior to VP.

Jingke, have you performed the same measurement on domU?
If so, can you post your results?

Anybody have any other ideas as to what might be
causing this (major) performance degradation?

Thanks,
Dan

________________________________

        From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Zhang,
Jingke
        Sent: Monday, May 22, 2006 1:49 AM
        To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
        Subject: [Xen-ia64-devel] kernel build performance data with
dom0_VP modeopen
        
        

        Hi all,

                 I have done kernel build with dom0_vp mode open to
compare with it close. The specific data as following:

        Environment :

        Memory:768M

        Platform : tiger4

        Cpu : Montecito C1 stepping

        Compile cmdline : time make >/dev/null 2>&1

        Configuration file : @arch/ia64/config/tiger_defconfig

         

                                                       time
Real                    user                    sys   

        Cset 10027 (with dom0_vp open):             14m48.377s
13m43.960s     0m51.670s

        Cset 10022 (with dom0_vp closed):          14m5.752s
13m13.200s     0m39.260s

        Native :
13m55.572s    13m4.366s       0m35.205s

        Performance : 

        Cset 10022: dom0/native =98.7%

        Cset 10027:dom0/native=94.1%

         

        From the result, we can see when dom0_vp mode open, the
performance of KB has 4.6% degradation. 

        Thanks 

        Zhang Jingke


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