Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch

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Subject: Re: [linux-audio-dev] Re: [announce] [patch] Voluntary Kernel Preemption Patch
From: Mark Lord (lkml_AT_rtr.ca)
Date: Sat Jul 24 2004 - 15:41:30 EEST

Note that the method used by hdparm tends to underreport
achievable throughput somewhat, because it generally only
ever has one I/O "in flight".

Cheers 

-- 
Mark Lord
(hdparm keeper & the original "Linux IDE Guy")

Lee Revell wrote:
> On Tue, 2004-07-20 at 08:19, Jens Axboe wrote:
> 
>>On Tue, Jul 20 2004, Ingo Molnar wrote:
>>
>>>>How much I/O do you allow to be in flight at once?  It seems like by
>>>>decreasing the maximum size of I/O that you handle in one interrupt
>>>>you could improve this quite a bit.  Disk throughput is good enough,
>>>>anyone in the real world who would feel a 10% hit would just throw
>>>>hardware at the problem.
...
> According to hdparm, the throughput is still quite good (42MB/sec on a 
> sub-$100 IDE drive).

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