linux-kernel - Re: [RFC][PATCH] per-task I/O throttling

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Message-ID: <20080112105702.GC25388@balbir.in.ibm.com>
Date:	Sat, 12 Jan 2008 16:27:02 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Valdis.Kletnieks@...edu, righiandr@...rs.sourceforge.net,
	LKML <linux-kernel@...r.kernel.org>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [RFC][PATCH] per-task I/O throttling

* Peter Zijlstra <a.p.zijlstra@...llo.nl> [2008-01-12 10:46:37]:

> 
> On Fri, 2008-01-11 at 23:57 -0500, Valdis.Kletnieks@...edu wrote:
> > On Fri, 11 Jan 2008 17:32:49 +0100, Andrea Righi said:
> > 
> > > The interesting feature is that it allows to set a priority for each
> > > process container, but AFAIK it doesn't allow to "partition" the
> > > bandwidth between different containers (that would be a nice feature
> > > IMHO). For example it would be great to be able to define per-container
> > > limits, like assign 10MB/s for processes in container A, 30MB/s to
> > > container B, 20MB/s to container C, etc.
> > 
> > Has anybody considered allocating based on *seeks* rather than bytes moved,
> > or counting seeks as "virtual bytes" for the purposes of accounting (if the
> > disk can do 50mbytes/sec, and a seek takes 5millisecs, then count it as 100K
> > of data)?
> 
> I was considering a time scheduler, you can fill your time slot with
> seeks or data, it might be what CFQ does, but I've never even read the
> code.
>

So far the definition of I/O bandwidth has been w.r.t time. Not all IO
devices have sectors; I'd prefer bytes over a period of time.

-- 
	Warm Regards,
	Balbir Singh
	Linux Technology Center
	IBM, ISTL
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