Date: Fri, 9 Mar 2001 04:29:08 -0800 (PST) From: "David E. O'Brien" <obrien@FreeBSD.org> To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/release/scripts doFS.sh Message-ID: <200103091229.f29CT8X97737@freefall.freebsd.org>
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obrien 2001/03/09 04:29:08 PST
Modified files:
release/scripts doFS.sh
Log:
Warner gave a nice followup in email, and I thought it would be nice to
get it in the CVS logs. This pertains to rev 1.30 (and the MFC of it):
Space optimization forces the kernel to always use fragments to store
parts of file, rather than using an entire block when less than an
entire block has been written. This forces files to be as small as
they can be at the minor cost of time to do all the fussy stuff. The
cpio image that we put on the disk was so close to filling the disk
exactly that this minor minor difference made a big difference. The
system changed things to time optmization on the first write. When
the end of file was hit, it tried to allocate a full block (4k), but
there was only 3k left on the disk (since you get only 1407 blocks on
a 1.44 floppy) so it failed. So this change nails the space
optmiziation in place for the whole operation.
Revision Changes Path
1.31 +1 -1 src/release/scripts/doFS.sh
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