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Re: iozone write 50% regression in kernel 2.6.24-rc1

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[view original message]
From: Martin Knoblauch <knobi@...>
To: Zhang, Yanmin <yanmin_zhang@...>, <a.p.zijlstra@...>
Cc: LKML <linux-kernel@...>
Subject: Re: iozone write 50% regression in kernel 2.6.24-rc1
Date: Friday, November 9, 2007 - 8:36 am

Hi Yanmin,


 could you tell us the exact iozone command you are using? I would like to repeat it on my setup, because I definitely see the opposite behaviour in 2.6.24-rc1/rc2. The speed there is much better than in 2.6.22 and before (I skipped 2.6.23, because I was waiting for the per-bdi changes). I definitely do not see the difference between 1st and subsequent runs. But then, I do my tests with 5GB file sizes like:


iozone3_283/src/current/iozone -t 5 -F /scratch/X1 /scratch/X2 /scratch/X3 /scratch/X4 /scratch/X5 -s 5000M -r 1024 -c -e -i 0 -i 1


Kind regards

Martin


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[view original message]
From: Zhang, Yanmin <yanmin_zhang@...>
To: Martin Knoblauch <knobi@...>
Cc: <a.p.zijlstra@...>, LKML <linux-kernel@...>
Subject: Re: iozone write 50% regression in kernel 2.6.24-rc1
Date: Sunday, November 11, 2007 - 8:45 pm

My machine uses SATA (AHCI) disk.


-yanmin

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Previous thread: 2.6.24-rc2 slab vs slob tbench numbers by Nick Piggin on Friday, November 9, 2007 - 8:36 am. (29 messages)

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