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Date:      Wed, 13 Jun 2001 10:20:58 +0930
From:      Greg Lehey <grog@FreeBSD.org>
To:        Josef Karthauser <joe@tao.org.uk>
Cc:        Eric Parusel <lists@globalrelay.net>, freebsd-stable@freebsd.org
Subject:   XFS (was: The FreeBSD core team needs your help)
Message-ID:  <20010613102058.F5486@wantadilla.lemis.com>
In-Reply-To: <20010612120958.G10614@tao.org.uk>; from joe@tao.org.uk on Tue, Jun 12, 2001 at 12:09:58PM %2B0100
References:  <20010608134705.19635.qmail@web14701.mail.yahoo.com> <004001c0f030$36a0d3e0$0600020a@frontend> <20010612120958.G10614@tao.org.uk>

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On Tuesday, 12 June 2001 at 12:09:58 +0100, Josef Karthauser wrote:
> On Fri, Jun 08, 2001 at 08:32:23AM -0700, Eric Parusel wrote:
>>>> A journalling FS for those people who just hate waiting for a
>> couple
>>>> of
>>>> TB of slow disks to fsck?
>>>
>>> Does ReiserFS work with FreeBSD?
>>
>>> From what I've read, XFS is quite good as well....  (Whether or not it
>> could ever work with *BSD, I don't know)
>
> Apparently XFS would run better on FreeBSD than on Linux, from what
> Adrian told me.  This is because linux apparently channels all I/O
> through 512k buffers 

They're not that big.  IIRC 4 kB is the maximum in 2.2 and earlier
kernels.  They've improved things somewhat in 2.4, but it's still a
mess.

> whereas XFS uses larger buffers to get it's speed.  FreeBSD's buffer
> cache doesn't have the same limitations that Linux's does.

Correct.  We do limit physical I/O to 128 kB, however.  That would
have to be rethought to do correctly some of the things that XFS does.

Greg
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