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From: Avi Kivity <avi@qumranet.com>
To: Laurent Vivier <Laurent.Vivier@bull.net>
Cc: kvm-devel@lists.sourceforge.net
Subject: Re: [PATCH 0/2] Batch writes to MMIO
Date: Wed, 23 Apr 2008 17:05:43 +0300	[thread overview]
Message-ID: <480F4237.90202@qumranet.com> (raw)
In-Reply-To: <12089560583282-git-send-email-Laurent.Vivier@bull.net>

Laurent Vivier wrote:
> These two patches allow to batch writes to MMIO.
>
> When kernel has to send MMIO writes to userspace, it stores them
> in memory until it has to pass the hand to userspace for another
> reason. This avoids to have too many context switches on operations
> that can wait.
>
>   

Did you obtain any measurable performance benefit?

> WARNING: this breaks compatibility with old userspace part.
>
>   

So it's just an RFC :)

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.


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  parent reply	other threads:[~2008-04-23 14:05 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2008-04-23 13:07 [PATCH 0/2] Batch writes to MMIO Laurent Vivier
2008-04-23 13:07 ` [PATCH 1/2] kvm: " Laurent Vivier
2008-04-23 13:07   ` [PATCH 2/2] kvm-userspace: " Laurent Vivier
2008-04-23 14:31   ` [PATCH 1/2] kvm: " Avi Kivity
2008-04-23 14:59     ` Laurent Vivier
2008-04-23 15:04       ` Avi Kivity
2008-04-23 16:53   ` Anthony Liguori
2008-04-23 14:05 ` Avi Kivity [this message]
2008-04-23 14:22   ` [PATCH 0/2] " Laurent Vivier
2008-04-23 14:40     ` Avi Kivity
2008-04-23 15:10       ` Anthony Liguori
2008-04-23 15:12         ` Avi Kivity
2008-04-23 15:47           ` Anthony Liguori
2008-04-23 17:13             ` Avi Kivity
2008-04-23 16:24         ` Laurent Vivier
2008-04-23 16:25           ` Avi Kivity
2008-04-23 16:41             ` Laurent Vivier
2008-04-23 16:48               ` Anthony Liguori
2008-04-23 16:51                 ` Avi Kivity
2008-04-23 18:54                 ` Laurent Vivier

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