Avi Kivity a écrit : > Aurelien Jarno wrote: >> On Sat, Jul 21, 2007 at 12:25:45AM +0200, Aurelien Jarno wrote: >> >>> Hi, >>> >>> I have just noticed that there is a huge performance regression in >>> network transfers between kvm-29 and kvm-31. Using the RTL8139 emulated >>> card, I have seen the network speed has been divided by 27!!! I haven't >>> made precise speed measurements with other emulated card, but the >>> network speed has been reduced by the same order. >>> >>> Those tests have been done on a Core 2 CPU. >>> >>> After some tests I have seen that the problem lies in the user part. I >>> will do a git bisect tomorrow to find the patch that has caused the >>> problem, unless somebody already find it. >>> >> 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. -- .''`. 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: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
