Am Montag, den 27.03.2006, 10:38 -0500 schrieb Jeff Dike: > On Sun, Mar 26, 2006 at 08:49:25PM +0200, Gerd Stolpmann wrote: > > I recently tried to benchmark the new AIO-based ubd driver (including > > O_DIRECT), and ran into serious problems with filesystems > 4GB. I think > > I found the problem; two overflows in ubd_kern.c (see patch). > > The first bit looks reasonable. I would change start to an unsigned > long long instead of casting, though. > > > I also experienced (hard) lockups when doing lots of I/O. But this seems > > to be unrelated to this problem (but who knows). > > What was your workload?
I used iozone in various ways. The simplest workload leading to problems was: - Write a 5GB file - Write it again - Read it back - Read it back This benchmark ran fine the first time I started it. When I started it again, UML locked up in the middle. This is reproducible. Gerd -- ------------------------------------------------------------ Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany [EMAIL PROTECTED] http://www.gerd-stolpmann.de Phone: +49-6151-153855 Fax: +49-6151-997714 ------------------------------------------------------------ ------------------------------------------------------- This SF.Net email is sponsored by xPML, a groundbreaking scripting language that extends applications into web and mobile media. Attend the live webcast and join the prime developer group breaking into this new coding territory! http://sel.as-us.falkag.net/sel?cmd=lnk&kid=110944&bid=241720&dat=121642 _______________________________________________ User-mode-linux-devel mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/user-mode-linux-devel
