From: Nick Piggin <piggin@cyberone.com.au>
To: tomlins@cam.org
Cc: Andrew Morton <akpm@digeo.com>, linux-kernel@vger.kernel.org
Subject: Re: [BENCHMARK] 2.5.68-mm3 with contest
Date: Fri, 02 May 2003 04:34:11 +1000 [thread overview]
Message-ID: <3EB168A3.4060207@cyberone.com.au> (raw)
In-Reply-To: <20030501115221.A85BC11B0B@oscar.casa.dyndns.org>
Ed Tomlinson wrote:
>Andrew Morton wrote:
>
>
>>Con Kolivas <kernel@kolivas.org> wrote:
>>
>>>All the io-write based loads were affected.
>>>
>>Yup. Mainly because the large queue increases truncate latencies.
>>
>
>Are there loads that do benefit from large queues? If so, does it make
>sense to use truncate impact (something like a decaying average of truncate
>time per interval) to control the size of the queues on the fly?
>
I'll post some more benchmarks, but I have found that loads with
lots of IO streams. Those with more than about 1/2 as many IO streams
as request slots start to show improvements. I don't think changing
the size of the queues on the fly would be any good. They can be
made runtime tunable quite easily now, which is a good bad solution.
next prev parent reply other threads:[~2003-05-01 18:22 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <fa.i2rq9k6.40evjg@ifi.uio.no>
[not found] ` <fa.hp8a369.1t0qqpt@ifi.uio.no>
2003-05-01 11:52 ` [BENCHMARK] 2.5.68-mm3 with contest Ed Tomlinson
2003-05-01 18:34 ` Nick Piggin [this message]
2003-04-30 10:49 Con Kolivas
2003-04-30 21:22 ` Andrew Morton
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