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Re: kioclusters

To: "Davida, Joe" <Joe_Davida@xxxxxxxxxx>
Subject: Re: kioclusters
From: Marcelo Tosatti <marcelo@xxxxxxxxxxxxxxxx>
Date: Mon, 4 Dec 2000 20:37:24 -0200 (BRST)
Cc: "'linux-xfs@xxxxxxxxxxx'" <linux-xfs@xxxxxxxxxxx>
In-reply-to: <09D1E9BD9C30D311919200A0C9DD5C2C0253704F@xxxxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx

On Mon, 4 Dec 2000, Davida, Joe wrote:

> You say you have seen performance problems with non-sequential
> localized writes using the kiocluster option on mounts.
> Is the performance problem bad enough so that it is worse
> than ext2fs?

Its probably worse than ext2.

The reason for that is because the prototype kiobuf IO layer which we are
using does not try aggregate any requests to avoid seek times while the
buffer_head IO does that.

We definately need merging of kiobuf IO in Linux 2.5. 

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