Re: DMA doesn't work since "make ata port as parent device of scsi host"
|[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]|
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. Bye, Jörg. -- But in the case of "git revert", it should be an ancestor (or the user is just insane, in which case it doesn't matter - insane people can do insane things) Linus Torvalds <alpine.LFD.1.00.0801041031590.2811@xxxxxxxxxxxxxxxxxxxxxxxxxx>
Description: Digital signature http://en.wikipedia.org/wiki/OpenPGP