>no ideas what can be done? why it is so slow? Let's try to catch the cause for the 74k ioexits per second. Please add #define DEBUG_IOPORT in qemu/vl.c and qemu/exec.c and recompile. After that when the guest runs and does 74k ioexits on idle, enter the qemu's monitor (ctrl-alt-1) enter 'log ioport'. All guest's ioport access will be written to /tmp/qemu.log. Be kind enough to calculate the statistics of ioport access per port number a second. With the numbers we can see the hardware that causes the slowness. -- Dor.
btw: are you using kvm-33 or older? > >i've tried the "-L /usr/shar/kvm" to use the kvm-bios but no better >performance ... > >Am Donnerstag, den 02.08.2007, 11:24 +0300 schrieb Avi Kivity: >> Ulrich Schreiner wrote: >> > dmesg|grep kvm >> > >> > SELinux: initialized (dev kvmfs, type kvmfs), uses genfs_contexts >> > kvm: emulating exchange as write >> > >> > >> >> There may be messages that aren't prefixed with 'kvm:' (that's a bug >> btw). Please check. >> >> > now booting into a F7 image, after the system is ready (and in >idle): >> > >> > top >> > PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ >COMMAND >> > 14917 root 20 0 332m 71m 66m S 6 0.9 1:17.05 qemu- >kvm >> > 14954 root 20 0 14552 1072 812 R 0 0.0 0:00.01 top >> > 1 root 20 0 10320 680 572 S 0 0.0 0:02.02 init >> > >> > kvm_stat (snapshot): >> > >> > kvm statistics >> > >> > exits 12254399 79079 >> > halt_exits 326543 4632 >> > invlpg 0 0 >> > io_exits 6539798 74320 >> > irq_exits 43523 29 >> > irq_window 4984 0 >> > mmio_exits 1319016 0 >> > pf_fixed 3140955 56 >> > pf_guest 448187 6 >> > request_irq 0 0 >> > signal_exit 39728 0 >> > tlb_flush 29511 31 >> > >> >> Wow -- lots of I/O exits. What does 'top' in the guest say? 'hdparm >> /dev/hda' in the guest? >> >> > when logging into the virtual machine (via ssh) the virtual world is >> > very slow: i set the time with "ntpdate" and wait exact one minute >in >> > reality. in the virtual image only 24sec are gone! >> > >> > and everything else in the image is really slow. >> > >> > >> > > >----------------------------------------------------------------------- - >- >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 ------------------------------------------------------------------------- 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
