Date: Thu, 4 Nov 2010 05:08:16 +0530 From: Aditya Sarawgi <sarawgi.aditya@gmail.com> To: Doug Barton <dougb@freebsd.org> Cc: fs@freebsd.org Subject: Re: ext2fs now extremely slow Message-ID: <AANLkTi=iTCG4aO-KO_gy7fp_96KcZ_TCyNk5OkLZUHV3@mail.gmail.com> In-Reply-To: <4CD0A3E8.4080304@FreeBSD.org> References: <20100929031825.L683@besplex.bde.org> <20100929084801.M948@besplex.bde.org> <20100929041650.GA1553@aditya> <201009290917.05269.jhb@freebsd.org> <20100929202526.GA1564@aditya> <4CD0A3E8.4080304@FreeBSD.org>
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On Wed, Nov 3, 2010 at 5:21 AM, Doug Barton <dougb@freebsd.org> wrote: > On 09/29/10 13:25, Aditya Sarawgi wrote: >> >> [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. =A0Would you be interested in reviewing and/or test= ing >>> that patch? =A0(I've attached it). =A0Here 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). > > Is anything happening with this? =A0I recently built a new system that is > multi-booting windows, freebsd, and ubuntu. I chose ext[23]fs for my /hom= e > partition so that I could share unix'y stuff between freebsd and linux, b= ut > I'm having both performance and stability problems, and today (fortunatel= y > for the first time, and fortunately recoverable) I had actual data loss. = I'm > happy to be a guinea pig for new code if people are reasonably sure that = it > will help, but if the situation doesn't improve I will have to reformat. > Are you suffering from these problems on CURRENT ? Can you please elaborate on the performance and stability issue you are facing ? Any specific scenar= io ? You can test Zheng's preallocation patch for ext2fs, there is a serious lack of testers for that. > On a related note, is there any way to use the journaling features of ext= 3fs > in FreeBSD? When I boot the linux partition it's treating the fs as ext3f= s, > but AFAICS we only have ext2fs capabilities. > Journaling is difficult to bring in, especially if one is planning to have a BSDL version. > FWIW, the reason I chose ext2fs is that linux doesn't have reliable r/w > support for ufs, and there are really good drivers to mount ext2fs > partitions in windows; which we also don't have for ufs. > > > Doug > > -- > > =A0 =A0 =A0 =A0Nothin' ever doesn't change, but nothin' changes much. > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0-- OK Go > > =A0 =A0 =A0 =A0Breadth of IT experience, and depth of knowledge in the DN= S. > =A0 =A0 =A0 =A0Yours for the right price. =A0:) =A0http://SupersetSolutio= ns.com/ > > _______________________________________________ > freebsd-fs@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-fs > To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" > --=20 Cheers, Aditya Sarawgi
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