From: Jan Kiszka <jan.kiszka@web.de>
To: Valentine Sinitsyn <valentine.sinitsyn@gmail.com>,
kvm <kvm@vger.kernel.org>,
Jailhouse <jailhouse-dev@googlegroups.com>
Subject: Re: SVM: vmload/vmsave-free VM exits?
Date: Tue, 07 Apr 2015 08:23:16 +0200 [thread overview]
Message-ID: <552377D4.1080605@web.de> (raw)
In-Reply-To: <552376F2.2050902@gmail.com>
On 2015-04-07 08:19, Valentine Sinitsyn wrote:
> On 07.04.2015 11:13, Jan Kiszka wrote:
>>>> It is, at least 160 cycles with hot caches on an AMD A6-5200 APU, more
>>>> towards 600 if they are colder (added some usleep to each loop in the
>>>> test).
>>> Great, thanks. Could you post absolute numbers, i.e how long do A and B
>>> take on your CPU?
>>
>> A is around 1910 cycles, B about 1750.
> It's with hot caches I guess? Not bad anyways, it's a pity I didn't
> observe this and didn't include this optimization from the day one.
Yes, that is with the unmodified benchmark I sent. When I add, say
usleep(1000) to that loop body, the cycles jumped to 4k (IIRC).
BTW, this is the Jailhouse patch:
https://github.com/siemens/jailhouse/commit/dbf2fe479ac07a677462dfa87e008e37a4e72858
Jan
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next prev parent reply other threads:[~2015-04-07 6:23 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-05 8:31 SVM: vmload/vmsave-free VM exits? Jan Kiszka
2015-04-05 17:12 ` Valentine Sinitsyn
2015-04-07 5:43 ` Jan Kiszka
2015-04-07 6:10 ` Valentine Sinitsyn
2015-04-07 6:13 ` Jan Kiszka
2015-04-07 6:19 ` Valentine Sinitsyn
2015-04-07 6:23 ` Jan Kiszka [this message]
2015-04-07 6:29 ` Valentine Sinitsyn
2015-04-07 6:35 ` Jan Kiszka
2015-04-13 7:01 ` Jan Kiszka
2015-04-13 17:29 ` Avi Kivity
2015-04-13 17:35 ` Jan Kiszka
2015-04-13 17:41 ` Avi Kivity
2015-04-13 17:48 ` Avi Kivity
2015-04-13 17:57 ` Jan Kiszka
2015-04-13 18:07 ` Avi Kivity
2015-04-13 18:14 ` Jan Kiszka
2015-04-14 6:39 ` Valentine Sinitsyn
2015-04-14 7:02 ` Jan Kiszka
2015-04-14 7:11 ` Valentine Sinitsyn
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