Messages in this thread | | | Date | Wed, 17 Nov 1999 15:33:04 +0100 (MET) | From | David Monniaux <> | Subject | bad performances on compressed ext2 on CD-Rom |
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Hi all,
the Demolinux project (http://www.demolinux.org) is designing CDs that can boot and run Linux all from a CD-Rom. As the capacity of a CD is quite limited, it was thought a good idea to use ext2 on-the-fly compression.
Two methods have been tried: - a big file on an ISO-9660 filesystem stored on the CD-Rom, containing an ext2fs+compression partition; - two partitions on the CD-Rom, the second of which is ext2fs+compression.
Both methods do work, but extremely slowly (6 minutes to load Netscape, for instance).
The problem is tricky, since doing the same but with the ext2 partition in a file on an ext2fs hard drive partition yields fast access times.
We suspect some bad interaction between e2compr and the CD-Rom layer; perhaps e2compr accesses the filesystem in patterns the CD-Rom driver is not optimized for.
Has anybody got ideas on this?
Regards, --- David Monniaux Tel: +33 1 44 32 20 66 Fax: +33 1 44 32 20 80 Laboratoire d'informatique de l'École Normale Supérieure, 45 rue d'Ulm - 75230 PARIS cedex 5 - FRANCE
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