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From: "J. R. Okajima" <hooanon05@yahoo.co.jp>
To: Phillip Lougher <phillip@lougher.demon.co.uk>
Cc: linux-fsdevel@vger.kernel.org
Subject: Re: Q. cache in squashfs?
Date: Sun, 11 Jul 2010 14:55:14 +0900	[thread overview]
Message-ID: <6909.1278827714@jrobl> (raw)
In-Reply-To: <4C3930E9.8080905@lougher.demon.co.uk>


Phillip Lougher:
> In your first column (ext3 on squashfs), only a small amount of the
> overall cost is being accounted to the 'cat10' command, the bulk of
> the work is being accounted to the kernel 'loop1' thread and this isn't
> showing up. In the other cases (Squashfs only) the entire cost is being
> accounted to the 'cat10' command.  The resulting results are therefore
> completely bogus, and incorrectly show higher CPU usage for Squashfs.

Ah, I forget about the kthread.
My question about CPU usage must be due to the kthread.
Also I could confirm that the sequential access pattern as you did shows
good performance.
While the very random access shows worse, it is a positive effect of
loopback caching as you wrote in your first reply.

Thank you very much.


J. R. Okajima

  reply	other threads:[~2010-07-11  5:55 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-06-24  2:37 Q. cache in squashfs? J. R. Okajima
2010-07-08  3:57 ` Phillip Lougher
2010-07-08  6:08   ` J. R. Okajima
2010-07-09  7:53     ` J. R. Okajima
2010-07-09 10:32       ` Phillip Lougher
2010-07-09 10:55         ` Phillip Lougher
2010-07-10  5:07           ` J. R. Okajima
2010-07-10  5:08             ` J. R. Okajima
2010-07-11  2:48             ` Phillip Lougher
2010-07-11  5:55               ` J. R. Okajima [this message]
2010-07-11  9:38                 ` [RFC 0/2] squashfs parallel decompression J. R. Okajima
2011-02-22 19:41                   ` Phillip Susi
2011-02-23  3:23                     ` Phillip Lougher
2010-07-11  9:38                 ` [RFC 1/2] squashfs parallel decompression, early wait_on_buffer J. R. Okajima
2010-07-11  9:38                 ` [RFC 2/2] squashfs parallel decompression, z_stream per cpu J. R. Okajima
2010-07-09 12:24         ` Q. cache in squashfs? J. R. Okajima

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