Date: Thu, 30 Sep 2010 01:55:29 +0530 From: Aditya Sarawgi <sarawgi.aditya@gmail.com> To: John Baldwin <jhb@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: ext2fs now extremely slow Message-ID: <20100929202526.GA1564@aditya> In-Reply-To: <201009290917.05269.jhb@freebsd.org> References: <20100929031825.L683@besplex.bde.org> <20100929084801.M948@besplex.bde.org> <20100929041650.GA1553@aditya> <201009290917.05269.jhb@freebsd.org>
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[snip] > > I see what you are saying. The gap of 8 block between the files > > is due to the old preallocation which used to allocate additional > > 8 blocks in advance for a particular inode when allocating a block > > for it. The gap between blocks of the same file shouldn't be there > > too. Both of these cases should be removed. I will look into this > > during this week. The slowness is also due to lack of preallocation > > in the new code. > > One of the GSoC students worked on a patch to add preallocation back to > ext2fs this summer. Would you be interested in reviewing and/or testing > that patch? (I've attached it). Here is his original e-mail: [snip] Hi John, I did a review of Zheng Liu's reservation window patch last week and I suggested him a few changes. Otherwise the code looks awesome. But it would be great if someone else can review the patch too and if everything goes well, we should merge this to HEAD. For the ext4 part, I still have to review his patches and I am planning to do it soon. Zheng is planning to have a separate module for ext4, and it does make sense. We are aiming at bringing ext4 to a usable state for 9-RELEASE (atleast read-only). Cheers Aditya Sarawgi
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