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Re: [PATCH] [RFC] xfs: byte range buffer dirty region tracking

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH] [RFC] xfs: byte range buffer dirty region tracking
From: Mark Tinguely <tinguely@xxxxxxx>
Date: Wed, 26 Feb 2014 08:53:59 -0600
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1393194354-12780-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1393194354-12780-1-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:9.0) Gecko/20120122 Thunderbird/9.0
On 02/23/14 16:25, Dave Chinner wrote:
From: Dave Chinner<dchinner@xxxxxxxxxx>
Switching this to just track the first and last modified bytes in
the block and only converting that to a dirty bitmap in the buffer
log item at format time, however, gets rid of most of this dirty
bitmap overhead without increasing memcpy time  at all. the result
is that peformance on a 64k directory block size increases to
roughly 16,000 files/s with memcpy() overhead only slightly
increasing.

Looks interesting. 4 regions seems reasonable to me.


--Mark.


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