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List:       user-mode-linux-user
Subject:    Re: [uml-user] ext3 slower than ext2
From:       Steve Freitas <sflist () ihonk ! com>
Date:       2002-04-18 20:06:56
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Hi Jeff,

Would you consider compiling ReiserFS into the kernel on the next UML
release? That way we can use that FS as a root filesystem without a
compile...

Which leads me to a broader question: Do you think that, in the future, one
might be able to load modules into the UML kernel at startup? I guess this
would require a copy of the right modules to be outside the UML as well, but
since you've already got those tar files in /usr/lib/uml...

Thanks!

Steve

> From: Steve Freitas <sflist@ihonk.com>
> Date: Mon, 15 Apr 2002 11:49:52 -0700
> To: Nathan Miller <nmiller_lists@visp.net>,
> <user-mode-linux-user@lists.sourceforge.net>, <jdike@karaya.com>
> Subject: Re: [uml-user] ext3 slower than ext2
> 
>> Plain and simple, ext3 is slow.  My previous benchmarks have proved it runs
>> at a little less than half the speed of ext2 with more overhead.  I've read
>> articles regarding this and it is because ext3 is not finished yet. It
>> still writes twice as much data as it's supposed to essentially mirroring
>> itself on every operation.  I guess that accounts for the 50% loss in speed
>> I get with it.
>> 
>> What I have found works well is reiserfs.  I'd recommend that for your UML
>> machine.
> 
> Thanks for the info, Nathan. To do that requires having reiserfs compiled
> into the UML kernel, correct?
> 
> Speaking of which, Jeff, I'm wondering if there might be a way in the future
> to preload modules into the UML kernel via command line switch on UML
> startup? That way, for those of us who'd like to avoid compiling our own UML
> kernels for whatever reason, we wouldn't have to bother you every time we'd
> like something compiled in.
> 
> If the answer is no, then consider yourself asked to compile reiserfs in
> next time. ;-)
> 
> Steve
> 
> 
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