Message-ID: <45E45BC5.30400@argo.co.il>
Date: Tue, 27 Feb 2007 18:26:45 +0200
From: Avi Kivity <avi@argo.co.il>
User-Agent: Thunderbird 1.5.0.9 (X11/20070212)
MIME-Version: 1.0
To: Ingo Molnar <mingo@elte.hu>
CC: suparna@in.ibm.com, Jens Axboe <jens.axboe@oracle.com>,
       linux-kernel@vger.kernel.org,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Arjan van de Ven <arjan@infradead.org>,
       Christoph Hellwig <hch@infradead.org>, Andrew Morton <akpm@zip.com.au>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Ulrich Drepper <drepper@redhat.com>, Zach Brown <zach.brown@oracle.com>,
       Evgeniy Polyakov <johnpol@2ka.mipt.ru>,
       "David S. Miller" <davem@davemloft.net>,
       Davide Libenzi <davidel@xmailserver.org>,
       Thomas Gleixner <tglx@linutronix.de>
Subject: Re: A quick fio test (was Re: [patch 00/13] Syslets, "Threadlets",
 generic AIO support, v3)
References: <20070223151515.GA12960@in.ibm.com> <20070223162508.GA16782@kernel.dk> <20070223171348.GA27838@in.ibm.com> <20070226135736.GF3822@kernel.dk> <20070226141315.GA15631@in.ibm.com> <20070226144548.GH3822@kernel.dk> <20070227043331.GA29942@in.ibm.com> <45E43827.4000102@argo.co.il> <20070227152507.GA8294@elte.hu> <45E45915.20204@argo.co.il> <20070227161617.GA16774@elte.hu>
In-Reply-To: <20070227161617.GA16774@elte.hu>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 794
Lines: 24

Ingo Molnar wrote:
>   
>> Maybe a device mapper delay target or nbd + O_DIRECT can insert delays 
>> to make the workload more disk-like.
>>     
>
> yeah. I'll hack a small timeout into loopback requests i think. But then 
> real disk-platter effects are left out ... so it all comes down to 
> eventually having to try it on real disks too :)
>   

Having a random component in the timeout may increase realism.

hundred-disk boxes are noisy, though the blinkenlights are nice :)


-- 
error compiling committee.c: too many arguments to function

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/