From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?iso-8859-1?Q?J=F6rg?= Sommer Subject: Re: DMA doesn't work since "make ata port as parent device of scsi host" Date: Thu, 15 Mar 2012 08:48:35 +0100 Message-ID: <20120315074835.GA18295@alea.gnuu.de> References: <20120315014807.GA3051@alea.gnuu.de> <1331776741.3436.33.camel@minggr> <1331781968.3436.43.camel@minggr> Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="BXVAT5kNtrzKuDFl" Return-path: Received: from uucp.gnuu.de ([83.246.114.63]:2795 "EHLO uucp.gnuu.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756888Ab2COHtt (ORCPT ); Thu, 15 Mar 2012 03:49:49 -0400 Content-Disposition: inline In-Reply-To: <1331781968.3436.43.camel@minggr> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Lin Ming Cc: Jeff Garzik , Tejun Heo , linux-ide@vger.kernel.org --BXVAT5kNtrzKuDFl Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable 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, J=F6rg Sommer wrote: > > > Hi, > > >=20 > > > I'm getting these messages in a KVM virtualized host and the access to > > > the disks is very slow. Using libata.dma=3D0 suppresses the warnings,= but > > > the disks are still slow. > >=20 > > Hi J=F6rg, > >=20 > > Let me try to reproduce this issue first. >=20 > I tried below commands on x86_32, but can't reproduce it. >=20 > qemu-system-i386 -kernel /root/vmlinuz-3.3.0-rc7 -append "root=3D/dev/sda1 > zcache" -hda /root/debian-32.img -hdb /root/data.img >=20 > Maybe because i386 uses different ata controller than ppc(ata_piix vs > pata-macio). >=20 > I'll try qemu-system-ppc. >=20 > 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 =BBINIT started=AB. 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=3D/dev/sda ro console=3DttyPZ0 init= =3D/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, J=F6rg. --=20 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 --BXVAT5kNtrzKuDFl Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature http://en.wikipedia.org/wiki/OpenPGP -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.12 (GNU/Linux) iEYEARECAAYFAk9hntMACgkQwe0mZwH1VIDo5ACgsjbz4XjNlR8IMigT2/KQnaYJ mLsAn3vAoBRXBN27U8ra+fKvYO001Ore =ewS6 -----END PGP SIGNATURE----- --BXVAT5kNtrzKuDFl--