From: Tejun Heo <htejun@gmail.com>
To: Jeff Garzik <jgarzik@pobox.com>
Cc: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>, linux-ide@vger.kernel.org
Subject: Re: cpu consumption
Date: Fri, 02 Dec 2005 11:14:16 +0900 [thread overview]
Message-ID: <438FADF8.5050209@gmail.com> (raw)
In-Reply-To: <438FAB44.5030807@pobox.com>
Jeff Garzik wrote:
> Raz Ben-Jehuda(caro) wrote:
>
>> Hello Jeff.
>> Here is my problem.
>>
>> When I issue a READ operation over a SATA disk in linux i have
>> huge cpu consumption , about 90% cpu usage.
>>
>> I am using MAXTOR disks in a supermicro machine.
>> the cpu test was made when i "raw read" from the DISK using DIRECT_IO.
>
>
> I dunno... do some profiling (in-kernel profiler, or oprofile) and see
> where the CPU is being consumed.
>
> Are you also seeing a lot of interrupts?
>
> Jeff
>
>
Jeff, this one is resolved. It turned out that Raz mistook wait time to
be busy.
Hmmm... marc doesn't show any mesage after 2005-11-25. This is is
resolved in a thread on linux-ide named "CPU usage is very high while
io'ing a sata disk" from Raz. The first message of the thread is posted
on 2005-11-30 06:23 +0900.
--
tejun
prev parent reply other threads:[~2005-12-02 2:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-11-26 13:45 cpu consumption Raz Ben-Jehuda(caro)
2005-12-02 2:02 ` Jeff Garzik
2005-12-02 2:14 ` Tejun Heo [this message]
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