From: Paolo Bonzini <pbonzini@redhat.com>
To: Chris Friesen <chris.friesen@windriver.com>, qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] is there a limit on the number of in-flight I/O operations?
Date: Sat, 19 Jul 2014 07:49:33 +0200 [thread overview]
Message-ID: <53CA06ED.1090102@redhat.com> (raw)
In-Reply-To: <53C9A440.7020306@windriver.com>
Il 19/07/2014 00:48, Chris Friesen ha scritto:
>>>
>>
>> I forgot about "-drive ...,iops_max=NNN". :)
>
> I'm not sure it's actually useful though, since it specifies the max IO
> operations per second, not the maximum number of in-flight operations.
No, that's "-drive iops=NNN". QEMU implements a leaky bucket algorithm,
where "iops_max" gives the size of the bucket and "iops" gives the
refill rate.
Paolo
> If the far end can't keep up with the requested rate of operations, then
> the number of in-flight operations is going to grow even if you throttle
> the number of operations per second.
next prev parent reply other threads:[~2014-07-19 5:49 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-18 14:58 [Qemu-devel] is there a limit on the number of in-flight I/O operations? Chris Friesen
2014-07-18 15:24 ` Paolo Bonzini
2014-07-18 16:22 ` Chris Friesen
2014-07-18 20:13 ` Paolo Bonzini
2014-07-18 22:48 ` Chris Friesen
2014-07-19 5:49 ` Paolo Bonzini [this message]
2014-07-19 6:27 ` Chris Friesen
2014-07-19 7:23 ` Paolo Bonzini
2014-07-19 8:45 ` Benoît Canet
2014-07-21 14:59 ` Chris Friesen
2014-07-21 15:15 ` Benoît Canet
2014-07-21 15:35 ` Chris Friesen
2014-07-21 15:54 ` Benoît Canet
2014-07-21 16:10 ` Benoît Canet
2014-08-23 0:59 ` Chris Friesen
2014-08-23 7:56 ` Benoît Canet
2014-08-25 15:12 ` Chris Friesen
2014-08-25 17:43 ` Chris Friesen
2015-08-27 16:37 ` Stefan Hajnoczi
2015-08-27 16:33 ` Stefan Hajnoczi
2014-08-25 21:50 ` Chris Friesen
2014-08-27 5:43 ` Chris Friesen
2015-05-14 13:42 ` Andrey Korolyov
2015-08-26 17:10 ` Andrey Korolyov
2015-08-26 23:31 ` Josh Durgin
2015-08-26 23:47 ` Andrey Korolyov
2015-08-27 0:56 ` Josh Durgin
2015-08-27 16:48 ` Stefan Hajnoczi
2015-08-27 17:05 ` Stefan Hajnoczi
2015-08-27 16:49 ` Stefan Hajnoczi
2015-08-28 0:31 ` Josh Durgin
2015-08-28 8:31 ` Andrey Korolyov
2014-07-21 19:47 ` Benoît Canet
2014-07-21 21:12 ` Chris Friesen
2014-07-21 22:04 ` Benoît Canet
2014-07-18 15:54 ` Andrey Korolyov
2014-07-18 16:26 ` Chris Friesen
2014-07-18 16:30 ` Andrey Korolyov
2014-07-18 16:46 ` Chris Friesen
[not found] <1000957815.25879188.1441820902018.JavaMail.zimbra@redhat.com>
2015-09-09 18:51 ` Jason Dillaman
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