From: Anton Ivanov <anton.ivanov@kot-begemot.co.uk>
To: Richard Weinberger <richard@nod.at>,
user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] [PATCH v3] um: Switch clocksource to hrtimers
Date: Thu, 29 Oct 2015 06:23:10 +0000 [thread overview]
Message-ID: <5631BB4E.4010301@kot-begemot.co.uk> (raw)
In-Reply-To: <562DFC90.9030308@nod.at>
I got the first patchset to build, it works very well on a single core
host or with CPU pinning of the UML - the performance gain is > 25%.
However, I introduced a race somewhere along the way - it crashes UML
reliably if you do not pin CPUs.
I will debug it, fix it and submit. I am guessing a week or so. IMHO 25%
is worth it :)
A.
On 26/10/15 10:12, Richard Weinberger wrote:
> Hi!
>
> Am 25.10.2015 um 19:46 schrieb Anton Ivanov:
>> Hi List, hi Richard,
>>
>> I am going to sort out the UBD patchset next as that has no dependencies on timer and the other stuff which is waiting in the queue behind the timers.
>>
>> That should give UML a significant boost. It is nothing particularly revolutionary (qemu has been using some of that for ages).
>>
>> I should be able to get these out of the door early on this week.
> Nice!
>
>> A.
>>
>> P.S. If there is anything to fix on the timer one, please shout.
> Looks good so far. Unless it breaks a lot it will be part of the 4.4 merge window. :)
>
> Thanks,
> //richard
>
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next prev parent reply other threads:[~2015-10-29 6:25 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-21 8:42 [uml-devel] [PATCH v3] um: Switch clocksource to hrtimers Anton Ivanov
2015-10-25 18:46 ` Anton Ivanov
2015-10-26 10:12 ` Richard Weinberger
2015-10-29 6:23 ` Anton Ivanov [this message]
2015-10-31 13:54 ` Richard Weinberger
2015-10-31 15:10 ` Thomas Meyer
2015-10-31 15:13 ` Richard Weinberger
2015-10-31 15:16 ` Thomas Meyer
2015-10-31 15:21 ` Richard Weinberger
2015-10-31 15:24 ` Thomas Meyer
2015-10-31 15:30 ` Richard Weinberger
2015-10-31 15:44 ` Thomas Meyer
2015-10-31 16:22 ` Anton Ivanov
2015-10-31 19:08 ` Richard Weinberger
2015-10-31 20:17 ` Anton Ivanov
2015-10-31 19:06 ` Richard Weinberger
2015-11-02 8:14 ` Anton Ivanov
2015-11-02 8:37 ` Richard Weinberger
2015-11-02 8:41 ` Anton Ivanov
2015-11-02 8:52 ` Richard Weinberger
2015-11-02 8:57 ` Anton Ivanov
2015-11-02 9:12 ` Richard Weinberger
2015-11-02 9:53 ` Anton Ivanov
2015-11-02 10:01 ` Richard Weinberger
2015-11-02 10:59 ` Anton Ivanov
2015-11-02 11:00 ` Anton Ivanov
2015-11-02 14:30 ` Anton Ivanov
2015-11-02 15:25 ` Richard Weinberger
2015-11-02 16:19 ` Anton Ivanov
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