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Date:      Tue, 27 Mar 2001 12:25:11 +0200
From:      Poul-Henning Kamp <phk@critter.freebsd.dk>
To:        Brian Somers <brian@Awfulhak.org>
Cc:        "David E. O'Brien" <obrien@FreeBSD.org>, cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   Re: cvs commit: src/sbin/newfs newfs.c 
Message-ID:  <75606.985688711@critter>
In-Reply-To: Your message of "Tue, 27 Mar 2001 09:18:32 BST." <200103270818.f2R8IWw48188@hak.lan.Awfulhak.org> 

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In message <200103270818.f2R8IWw48188@hak.lan.Awfulhak.org>, Brian Somers write
s:
>>   Log:
>>   The common wisdom is to use the largest number of cylinders per group.
>>   So bump the default from `16' to `22', which is the largest value allowed
>>   with the current default block size.  This change increases the the
>>   group size from 32MB/g to 44MB/g on a 4GB SCSI disk.
>
>Does this increase performance ?

I have seen it increase performance, and I have seen it make no
difference but it has never hurt performance for me.

I think tuning UFS/FFS is far more tricky than anticipated because
parts of our kernel (clustering for instance) seems to prefer the
standard block/frag size.

--
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.

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