Re: kvm tuning guide
On Wed, Sep 30, 2009 at 08:20:35AM +0200, Avi Kivity wrote: > On 09/30/2009 07:09 AM, Nikola Ciprich wrote: >> "The default, IDE, is highly supported by guests but may be slow, especially >> with disk arrays. If your guest supports it, use the virtio interface:" >> Avi, >> what is the status of data integrity issues Chris Hellwig summarized some >> time ago? >> > > I don't know. Christoph? On the qemu side everything is in git HEAD now, but I'm not sure about the qemu-0.11 release as I haven't really followed it. For the guest kernel the virtio cache flush support is now in mainline (past-2.6.31). For the host kernel side about 2/3 of the fixes are now in mainline (past-2.6.31) with the others hopefully getting in this merge window. >> Is it safe to recommend virtio to newbies already? > > I think so. I wouldn't. At least not for people caring about their data. It will take a while to promote the guest side fixes to all the interesting guests. IDE has the major advantage that cache flush support has been around in the guest driver for a long time so we only need to fix the host side which is a lot easier. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: kvm tuning guide
On 09/30/2009 07:09 AM, Nikola Ciprich wrote: "The default, IDE, is highly supported by guests but may be slow, especially with disk arrays. If your guest supports it, use the virtio interface:" Avi, what is the status of data integrity issues Chris Hellwig summarized some time ago? I don't know. Christoph? Is it safe to recommend virtio to newbies already? I think so. Shouldn't SCSI be safer (where applicable)? SCSI suffers from being untested, and I think doesn't truly offer the parallelism it appears to. nik On Tue, Sep 29, 2009 at 07:30:55PM +0200, Avi Kivity wrote: I wrote a short tuning guide for kvm, http://www.linux-kvm.org/page/Tuning_KVM. It should all be well known to the list, but a newbie is born every minute. Please review and expand! -- error compiling committee.c: too many arguments to function -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: kvm tuning guide
"The default, IDE, is highly supported by guests but may be slow, especially with disk arrays. If your guest supports it, use the virtio interface:" Avi, what is the status of data integrity issues Chris Hellwig summarized some time ago? Is it safe to recommend virtio to newbies already? Shouldn't SCSI be safer (where applicable)? nik On Tue, Sep 29, 2009 at 07:30:55PM +0200, Avi Kivity wrote: > I wrote a short tuning guide for kvm, > http://www.linux-kvm.org/page/Tuning_KVM. It should all be well known > to the list, but a newbie is born every minute. Please review and > expand! > > -- > error compiling committee.c: too many arguments to function > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majord...@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- - Nikola CIPRICH LinuxBox.cz, s.r.o. 28. rijna 168, 709 01 Ostrava tel.: +420 596 603 142 fax:+420 596 621 273 mobil: +420 777 093 799 www.linuxbox.cz mobil servis: +420 737 238 656 email servis: ser...@linuxbox.cz - -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Re: kvm tuning guide
Avi Kivity escreveu: but a newbie is born every minute. Reporting in! As a newbie in KVM, I really appreciate those efforts. Promise to help on docs when I realize that I know what I am doing. :) Thank you. -- Leandro Quibem Magnabosco. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
