From: Jeff Garzik <jgarzik@pobox.com>
To: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>
Cc: linux-ide@vger.kernel.org
Subject: Re: cpu consumption
Date: Thu, 01 Dec 2005 21:02:44 -0500 [thread overview]
Message-ID: <438FAB44.5030807@pobox.com> (raw)
In-Reply-To: <5d96567b0511260545j61970a01j3b5c435766a51a6d@mail.gmail.com>
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
next prev parent reply other threads:[~2005-12-02 2:02 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 [this message]
2005-12-02 2:14 ` Tejun Heo
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