From: Joerg Roedel <joro@8bytes.org>
To: Avi Kivity <avi@redhat.com>
Cc: Joerg Roedel <joerg.roedel@amd.com>,
Alexander Graf <agraf@suse.de>,
kvm@vger.kernel.org, anthony@codemonkey.ws, avi@qumranet.com
Subject: Re: First performance numbers
Date: Sat, 20 Sep 2008 08:55:05 +0200 [thread overview]
Message-ID: <20080920065505.GJ27426@8bytes.org> (raw)
In-Reply-To: <48D4524A.80902@redhat.com>
On Fri, Sep 19, 2008 at 06:30:50PM -0700, Avi Kivity wrote:
> Joerg Roedel wrote:
> >Ok, here are some performance numbers for nested svm. I ran kernbench -M
> >on a virtual machine with 4G RAM and 1 VCPU (since nesting SMP guests
> >do currently not work). I measured simple virtualization with a shadow
> >paging guest on bare metal and within a nested guest (same guest image)
> >on a nested paging enabled first level guest.
> >
> > | Shadow Guest (100%) | Nested Guest (X) | X
> >-----------------+---------------------+-------------------+--------
> >Elapsed Time | 553.244 (1.21208) | 1185.95 (20.0365) | 214.363%
> >User Time | 407.728 (0.987279) | 520.434 (8.55643) | 127.642%
> >System Time | 144.828 (0.480645) | 664.528 (11.6648) | 458.839%
> >Percent CPU | 99 (0) | 99 (0) | 100.000%
> >Context Switches | 98265.2 (183.001) | 220015 (3302.74) | 223.899%
> >Sleeps | 49397.8 (31.0274) | 49460.2 (364.84) | 100.126%
> >
> >So we have an overall slowdown in the first nesting level of more than
> >50%. Mostly because we spend so much time in the system level. Seems
> >there is some work to do for performance improvements :-)
> >
> >
>
> Do you have kvm_stat output for the two cases? Also interesting to run
> kvm_stat on both guest and host.
Sorry, no. But I can repeat the measurements and gather these numbers.
Joerg
prev parent reply other threads:[~2008-09-20 6:55 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-17 13:41 [PATCH 0/9] Add support for nested SVM (kernel) v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 1/9] Add CPUID feature flag for SVM v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 2/9] Clean up VINTR setting v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 3/9] Add helper functions for nested SVM v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 4/9] Implement GIF, clgi and stgi v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 5/9] Implement hsave v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 6/9] Add VMLOAD and VMSAVE handlers v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 7/9] Add VMRUN handler v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 8/9] Add VMEXIT handler and intercepts v3 Alexander Graf
2008-09-17 13:41 ` [PATCH 9/9] Allow setting the SVME bit v3 Alexander Graf
2008-09-19 15:59 ` [PATCH 7/9] Add VMRUN handler v3 Joerg Roedel
2008-09-25 17:32 ` Alexander Graf
2008-09-25 17:37 ` Joerg Roedel
2008-09-25 20:00 ` Alexander Graf
2008-09-25 21:22 ` joro
2008-09-27 12:59 ` Avi Kivity
2008-09-27 12:58 ` Avi Kivity
2008-09-25 18:47 ` [PATCH 4/9] Implement GIF, clgi and stgi v3 Joerg Roedel
2008-09-25 19:55 ` Alexander Graf
2008-09-25 21:27 ` Joerg Roedel
2008-09-26 9:01 ` Alexander Graf
2008-09-27 12:55 ` Avi Kivity
2008-09-27 12:52 ` Avi Kivity
2008-09-19 14:36 ` [PATCH 0/9] Add support for nested SVM (kernel) v3 Joerg Roedel
2008-09-19 14:39 ` Joerg Roedel
2008-09-19 15:56 ` Joerg Roedel
2008-10-15 17:07 ` Alexander Graf
2008-09-19 21:48 ` First performance numbers Joerg Roedel
2008-09-20 1:30 ` Avi Kivity
2008-09-20 6:55 ` Joerg Roedel [this message]
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