On Thu, 2012-03-15 at 16:59 +0100, Jörg Sommer wrote: > Lin Ming hat am Thu 15. Mar, 16:19 (+0800) geschrieben: > > On Thu, 2012-03-15 at 08:48 +0100, Jörg Sommer wrote: > > > Lin Ming hat am Thu 15. Mar, 11:26 (+0800) geschrieben: > > > > On Thu, 2012-03-15 at 09:59 +0800, Lin Ming wrote: > > > > > On Thu, 2012-03-15 at 02:48 +0100, Jörg Sommer wrote: > > > > > > Hi, > > > > > > > > > > > > I'm getting these messages in a KVM virtualized host and the access to > > > > > > the disks is very slow. Using libata.dma=0 suppresses the warnings, but > > > > > > the disks are still slow. > > > > > > > > > > Hi Jörg, > > > > > > > > > > Let me try to reproduce this issue first. > > > > > > > > I tried below commands on x86_32, but can't reproduce it. > > > > > > > > qemu-system-i386 -kernel /root/vmlinuz-3.3.0-rc7 -append "root=/dev/sda1 > > > > zcache" -hda /root/debian-32.img -hdb /root/data.img > > > > > > > > Maybe because i386 uses different ata controller than ppc(ata_piix vs > > > > pata-macio). > > > > > > > > I'll try qemu-system-ppc. > > > > > > > > Did you need to run some workload to trigger these warings? > > > > Or did you get these warnings right after booting the VM? > > > > > > These warnings come up before »INIT started«. I don't have to do > > > anything, just wait and see. > > > > > > # truncate -s100M /mnt/data/new > > > # mke2fs -Fq /mnt/data/new > > > # mount -o loop /mnt/data/new /mnt/other > > > # cp --parents /bin/zsh-static /mnt/other/zsh > > > # umount /mnt/other > > > # qemu-system-ppc -enable-kvm -M mac99 -cpu G4 -k de -kernel /boot/vmlinuz-3.3.0-rc5-04520-g8d233c0 -append 'root=/dev/sda ro console=ttyPZ0 init=/zsh' -hda /mnt/data/new > > > > > > I've uploaded my config and the kernel: > > > http://alioth.debian.org/~jo-guest/config-3.3.0-rc5-04520-g8d233c0 > > > http://alioth.debian.org/~jo-guest/vmlinuz-3.3.0-rc5-04520-g8d233c0 > > > > > > You have to switch to the serial console (Ctrl-Alt-3 or with -nographic > > > Ctrl-a c). All kernel messages arrive there. > > > > > > > Would you please try to disable ata port runtime pm? > > > > You can disable it by, for example, > > > > > > Is this also possible with a kernel parameter? It takes very long until I > > > get a shell prompt. > > > > No, but you can try below debug patch to disable port runtime pm. > > > > diff --git a/drivers/ata/libata-transport.c b/drivers/ata/libata-transport.c > > index 74aaee3..8def3fc 100644 > > --- a/drivers/ata/libata-transport.c > > +++ b/drivers/ata/libata-transport.c > > @@ -293,7 +293,6 @@ int ata_tport_add(struct device *parent, > > > > device_enable_async_suspend(dev); > > pm_runtime_set_active(dev); > > - pm_runtime_enable(dev); > > This patch doesn't change anything. The kernel still hangs. If you have > more patches or ideas, let me know. I have reproduced this issue with qemu-system-pcc on x86. Now I am debugging where the problem is. Thanks, Lin Ming > > Bye, Jörg. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
