linux-kernel - Re: Support for global block IO throttling?

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Date:	Fri, 1 Apr 2011 10:05:41 +0200
From:	Juerg Haefliger <juergh@...il.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: Support for global block IO throttling?

Hi Vivek,

> Also current IO controller does not work for NFS. So if a global limit
> is imposed in higher layers it will solve that issue too.
>
> Also if you implement it above page cache then it should automatically
> handle the case of async writes too. The downside is that if limits
> are low, buffered writers will be throttled very frequently.

I'm not exactly sure where in the stack you see this global bandwidth
controller. What do you mean by 'above the page cache'? I interpret
this such that access to the page cache would be bandwidth limited as
well? That doesn't sound right to me.

Thanks
...Juerg
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