From: Rick Jones <rick.jones2@hp.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Shirley Ma <mashirle@us.ibm.com>,
David Miller <davem@davemloft.net>,
eric.dumazet@gmail.com, avi@redhat.com, arnd@arndb.de,
netdev@vger.kernel.org, kvm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: getting host CPU utilization (was Re: [PATCH V7 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb)
Date: Mon, 30 Apr 2012 09:54:47 -0700 [thread overview]
Message-ID: <4F9EC3D7.1090906@hp.com> (raw)
In-Reply-To: <20120430091246.GB5414@redhat.com>
On 04/30/2012 02:12 AM, Michael S. Tsirkin wrote:
> On Tue, Jun 28, 2011 at 10:19:48AM -0700, Rick Jones wrote:
>> one of these days I'll have to find a good way to get accurate
>> overall CPU utilization from within a guest and teach netperf about
>> it.
>
> I think the cleanest way would be to run another netperf server on the
> host. netperf would get a flag with host address and get cpu
> utilization info.
>
> This is what we currently do manually: run mpstat on the host.
>
> Thoughts?
I might be able to enhance the LOC_CPU/REM_CPU calibration tests to be
bona fide CPU utilization tests.
> By the way, could you point me to code used by netperf
> to measure CPU utilization on Linux? I'd like to figure
> out why isn't the result always consistent with e.g. mpstat.
That would be src/netcpu_procstat.c . That code is automagically
selected by the configure script when it determines the compilation is
happening under Linux. You can, if you wish, manually set it though I
suspect the only other mechanism known to netperf that would function
under Linux is the "looper" (aka CPU soaker) method.
rick
next prev parent reply other threads:[~2012-04-30 16:54 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-28 19:23 [PATCH V7 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb Shirley Ma
2011-06-27 15:45 ` Shirley Ma
2011-06-27 22:54 ` David Miller
2011-06-28 16:51 ` Shirley Ma
2011-06-28 17:19 ` Rick Jones
2012-04-30 9:12 ` getting host CPU utilization (was Re: [PATCH V7 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb) Michael S. Tsirkin
2012-04-30 16:54 ` Rick Jones [this message]
2011-06-28 23:35 ` [PATCH V7 2/4 net-next] skbuff: Add userspace zero-copy buffers in skb David Miller
2011-06-29 4:28 ` Shirley Ma
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