On Saturday 20 August 2005 15:39, Markus Hochholdinger wrote: > Hi, > > Am Samstag, 20. August 2005 15:16 schrieb Markus Hochholdinger: > > Uhm, i now have to test this with async ubd devices because i had the > > sync option for ubd on.
About the host FS, I've seen a paper from LinuxSymposium2005 recommending XFS as host fs, because UML reading its big FS file has needs similar to multimedia applications. Also, you should experiment a bit with I/O elevators on those disks (and remember you can set the elevator per-block device via sysfs). Having anticipatory scheduling both in the host and in the guest doesn't help, likely. > ok, async ubd gets 18-20MB/s. So ubd to a partition is twice faster! > Can anybody tell me if async ubd to a partition is save e.g. in case of a > host power failure? Depends on the FS you use inside UML. We had report of reiserfs corruption, but never had of ext3 corruption. However, those are not guarantees, are just "rule of thumb" results. YMMV. And at that time, reiserfs hadn't "data=ordered" option. -- Inform me of my mistakes, so I can keep imitating Homer Simpson's "Doh!". Paolo Giarrusso, aka Blaisorblade (Skype ID "PaoloGiarrusso", ICQ 215621894) http://www.user-mode-linux.org/~blaisorblade ___________________________________ Yahoo! Mail: gratis 1GB per i messaggi e allegati da 10MB http://mail.yahoo.it ------------------------------------------------------- SF.Net email is Sponsored by the Better Software Conference & EXPO September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices Agile & Plan-Driven Development * Managing Projects & Teams * Testing & QA Security * Process Improvement & Measurement * http://www.sqe.com/bsce5sf _______________________________________________ User-mode-linux-user mailing list User-mode-linux-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/user-mode-linux-user
