J?rgen Keil wrote: > Bart wrote: > > >> The more interesting question is >> MB/sec from the dvd drive during the install. >> > > And note that in a lot of cases the MB/sec from the optical drive > during the install is quite low, because hsfs issues 2k read > requests to the drive, even when reading a multi-megabyte > compressed package archive file. AFAIK, file data on the iso9660 > installation media doesn't use sector interleaving, so hsfs could > do a much better job here and read ahead data in bigger clusters. > > Test case: watch "iostat -xnzc 5" while reading from an > optical media, using different block sizes: > > dd if=/dev/rdsk/c2t1d0p0 of=/dev/null bs=2k > dd if=/dev/rdsk/c2t1d0p0 of=/dev/null bs=32k > > This SONY DVD RW AW-G170A (and a DVD-RW media) > is reading ~3 MB/sec using 2k read requests, and ~8 MB/sec > when using 32k reads. >
My hsfs enhancements for Live Media fix this shortcoming of hsfs. It issues whole page reads where there is no interleaving and does re-ordering. So it can coalesce multiple pages into a single larger read. I sent out the changes for review on caiman-discuss sometime back. http://bugs.opensolaris.org/view_bug.do?bug_id=6588256 http://www.genunix.org/distributions/belenix_site//binfiles/hsfswebrev/index.htm Regards, Moinak. > > This message posted from opensolaris.org > _______________________________________________ > install-discuss mailing list > install-discuss at opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/install-discuss >
