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Date: Mon, 10 Feb 2003 23:14:45 +1100
From: Nick Piggin <piggin@cyberone.com.au>
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To: Andrea Arcangeli <andrea@suse.de>
CC: Andrew Morton <akpm@digeo.com>, reiser@namesys.com, jakob@unthought.net,
       david.lang@digitalinsight.com, riel@conectiva.com.br,
       ckolivas@yahoo.com.au, linux-kernel@vger.kernel.org, axboe@suse.de
Subject: Re: stochastic fair queueing in the elevator [Re: [BENCHMARK] 2.4.20-ck3
 / aa / rmap with contest]
References: <20030210085649.GO31401@dualathlon.random> <20030210010937.57607249.akpm@digeo.com> <3E4779DD.7080402@namesys.com> <20030210101539.GS31401@dualathlon.random> <3E4781A2.8070608@cyberone.com.au> <20030210111017.GV31401@dualathlon.random> <3E478C09.6060508@cyberone.com.au> <20030210113923.GY31401@dualathlon.random> <20030210034808.7441d611.akpm@digeo.com> <3E4792B7.5030108@cyberone.com.au> <20030210121018.GE31401@dualathlon.random>
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Andrea Arcangeli wrote:

>On Mon, Feb 10, 2003 at 10:53:27PM +1100, Nick Piggin wrote:
>
>>Andrew Morton wrote:
>>
>>
>>>Andrea Arcangeli <andrea@suse.de> wrote:
>>>
>>>
>>>>It's the readahead in my tree that allows the reads to use the max scsi
>>>>command size. It has nothing to do with the max scsi command size
>>>>itself.
>>>>
>>>>
>>>Oh bah.
>>>
>>>-               *max_ra++ = vm_max_readahead;
>>>+               *max_ra = ((128*4) >> (PAGE_SHIFT - 10)) - 1;
>>>
>>>
>>>Well of course that will get bigger bonnie numbers, for exactly the reasons
>>>I've explained.  It will seek between files after every 512k rather than
>>>after every 128k.
>>>
>>>
>>Though Andrea did say it is a "single threaded" streaming read.
>>
>
>yes, I pointed you to bonnie read sequential in bigbox.html, not
>tiobench.
>
The same pattern is also observed with single threaded tiobench
anyway.

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