On Sun, Jul 22, 2007 at 01:30:14PM +0300, Avi Kivity wrote: > Aurelien Jarno wrote: > >>> > >>> I finally didn't resist to run git bisect before going to bed... > >>> > >>> The patch that causes the regression is: > >>> > >>> commit 7d2e674835492040c9baddf0989a95abea9a8d0f > >>> Author: Avi Kivity <[EMAIL PROTECTED]> > >>> Date: Sun Jul 15 15:08:23 2007 +0300 > >>> > >>> kvm: qemu: synchronous signal handling > >>> > >>> in order to ensure that signals are handled with the global lock > >>> held, we > >>> block them, and dequeue them with sigtimedwait(). we can then call > >>> the > >>> handlers directly. > >>> > >>> this ensures that the device model and internal qemu data structures > >>> are not > >>> corrupted by cpu 0 thread handling a signal while cpu 1 is servicing > >>> a pio > >>> or mmio request. > >>> > >>> > >>> > >> Is this with -net user or -net tap? > >> > >> > > > > With -net tap. > > > > > > I pushed a commit which fixes a latency issue with that commit. However > with my test (ping -f against the host) I only get a x2 performance > increase. Can you test kvm-userspace.git? And can you detail your > benchmark?
Yes, that fixes the problem. However it seems it has broken SMP support, I am not able to boot a linux guest with 2 CPU with this patch. About my benchmark, I am just copying a big file using scp between the guest and the host, and I saw a drop from 7,5 MiB/s to 280 kiB/s. Aurelien -- .''`. Aurelien Jarno | GPG: 1024D/F1BCDB73 : :' : Debian developer | Electrical Engineer `. `' [EMAIL PROTECTED] | [EMAIL PROTECTED] `- people.debian.org/~aurel32 | www.aurel32.net ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
