From: Dor Laor <dlaor@redhat.com> To: Anthony Liguori <anthony@codemonkey.ws> Cc: Paolo Bonzini <pbonzini@redhat.com>, Avi Kivity <avi@redhat.com>, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>, kvm-devel <kvm@vger.kernel.org>, qemu-devel <qemu-devel@nongnu.org> Subject: Re: [Qemu-devel] Better qemu/kvm defaults (was Re: [RFC PATCH 0/4] Gang scheduling in CFS) Date: Wed, 04 Jan 2012 00:59:50 +0200 [thread overview] Message-ID: <4F038866.1060705@redhat.com> (raw) In-Reply-To: <4F0384FF.8070207@codemonkey.ws> On 01/04/2012 12:45 AM, Anthony Liguori wrote: > >>> When using 'guests-pick', we initially present the most compatible >>> network model (rtl8139, for instance). We would provide a paravirtual >>> channel (guest-agent?) that could be used to enumerate which models were >>> available and let guest decide which model to use for the next reboot. >>> You could also enable immediate switch over using hot plug. >> >> If guest uses an agent, it probably has virtio-serial driver and it >> indicates it >> has other virtio ones, otherwise, the agent won't fly > > Right, but I still you want the ability for the guest to indicate that > it would like to use virtio drivers or not. It would probably require a PCI 4.0 edition... > If you think about it, it makes no sense to choose which type of device > gets used in the hypervisor. In an ideal world, the guest would just > figure out what it wants to see and get that. > > The same is probably true about most device model properties. rtc clock > slew policy is another good example. Instead of trying to figure out > what the guest type is, we should just let the guest request device > model settings like that. The poor guest only wanted to have a real time clock that works w/ fine grain time stamps. It was x86 vendors w/ the help of few programmers who kept addition various ideas like tsc, hpet, constant_tsc, non stop tsc, really really non stop tsc + timer,... Cheers, Dor
WARNING: multiple messages have this Message-ID (diff)
From: Dor Laor <dlaor@redhat.com> To: Anthony Liguori <anthony@codemonkey.ws> Cc: qemu-devel <qemu-devel@nongnu.org>, Paolo Bonzini <pbonzini@redhat.com>, Avi Kivity <avi@redhat.com>, Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>, kvm-devel <kvm@vger.kernel.org> Subject: Re: [Qemu-devel] Better qemu/kvm defaults (was Re: [RFC PATCH 0/4] Gang scheduling in CFS) Date: Wed, 04 Jan 2012 00:59:50 +0200 [thread overview] Message-ID: <4F038866.1060705@redhat.com> (raw) In-Reply-To: <4F0384FF.8070207@codemonkey.ws> On 01/04/2012 12:45 AM, Anthony Liguori wrote: > >>> When using 'guests-pick', we initially present the most compatible >>> network model (rtl8139, for instance). We would provide a paravirtual >>> channel (guest-agent?) that could be used to enumerate which models were >>> available and let guest decide which model to use for the next reboot. >>> You could also enable immediate switch over using hot plug. >> >> If guest uses an agent, it probably has virtio-serial driver and it >> indicates it >> has other virtio ones, otherwise, the agent won't fly > > Right, but I still you want the ability for the guest to indicate that > it would like to use virtio drivers or not. It would probably require a PCI 4.0 edition... > If you think about it, it makes no sense to choose which type of device > gets used in the hypervisor. In an ideal world, the guest would just > figure out what it wants to see and get that. > > The same is probably true about most device model properties. rtc clock > slew policy is another good example. Instead of trying to figure out > what the guest type is, we should just let the guest request device > model settings like that. The poor guest only wanted to have a real time clock that works w/ fine grain time stamps. It was x86 vendors w/ the help of few programmers who kept addition various ideas like tsc, hpet, constant_tsc, non stop tsc, really really non stop tsc + timer,... Cheers, Dor
next prev parent reply other threads:[~2012-01-03 23:00 UTC|newest] Thread overview: 95+ messages / expand[flat|nested] mbox.gz Atom feed top 2011-12-19 8:33 [RFC PATCH 0/4] Gang scheduling in CFS Nikunj A. Dadhania 2011-12-19 8:34 ` [RFC PATCH 1/4] sched: Adding cpu.gang file to cpu cgroup Nikunj A. Dadhania 2011-12-19 8:34 ` [RFC PATCH 2/4] sched: Adding gang scheduling infrastrucure Nikunj A. Dadhania 2011-12-19 15:51 ` Peter Zijlstra 2011-12-19 16:51 ` Peter Zijlstra 2011-12-20 1:43 ` Nikunj A Dadhania 2011-12-20 1:39 ` Nikunj A Dadhania 2011-12-19 8:34 ` [RFC PATCH 3/4] sched: Gang using set_next_buddy Nikunj A. Dadhania 2011-12-19 8:35 ` [RFC PATCH 4/4] sched:Implement set_gang_buddy Nikunj A. Dadhania 2011-12-19 15:51 ` Peter Zijlstra 2011-12-20 1:43 ` Nikunj A Dadhania 2011-12-26 2:30 ` Nikunj A Dadhania 2011-12-19 11:23 ` [RFC PATCH 0/4] Gang scheduling in CFS Ingo Molnar 2011-12-19 11:44 ` Avi Kivity 2011-12-19 11:50 ` Nikunj A Dadhania 2011-12-19 11:59 ` Avi Kivity 2011-12-19 12:06 ` Nikunj A Dadhania 2011-12-19 12:50 ` Avi Kivity 2011-12-19 13:09 ` Nikunj A Dadhania 2011-12-19 11:45 ` Nikunj A Dadhania 2011-12-19 13:22 ` Nikunj A Dadhania 2011-12-19 16:28 ` Ingo Molnar 2011-12-21 10:39 ` Nikunj A Dadhania 2011-12-21 10:43 ` Avi Kivity 2011-12-23 3:20 ` Nikunj A Dadhania 2011-12-23 10:36 ` Ingo Molnar 2011-12-25 10:58 ` Avi Kivity 2011-12-25 15:45 ` Avi Kivity 2011-12-26 3:14 ` Nikunj A Dadhania 2011-12-26 9:05 ` Avi Kivity 2011-12-26 11:33 ` Nikunj A Dadhania 2011-12-26 11:41 ` Avi Kivity 2011-12-27 1:47 ` Nikunj A Dadhania 2011-12-27 9:15 ` Avi Kivity 2011-12-27 10:24 ` Nikunj A Dadhania 2011-12-29 16:07 ` Better qemu/kvm defaults (was Re: [RFC PATCH 0/4] Gang scheduling in CFS) Dor Laor 2011-12-29 16:07 ` [Qemu-devel] " Dor Laor 2011-12-29 16:13 ` Avi Kivity 2011-12-29 16:13 ` [Qemu-devel] " Avi Kivity 2011-12-29 16:16 ` Anthony Liguori 2011-12-29 16:16 ` Anthony Liguori 2012-01-01 10:16 ` Dor Laor 2012-01-01 10:16 ` [Qemu-devel] " Dor Laor 2012-01-01 14:01 ` Ronen Hod 2012-01-01 14:01 ` Ronen Hod 2012-01-02 9:37 ` Dor Laor 2012-01-02 9:37 ` [Qemu-devel] " Dor Laor 2012-01-03 15:48 ` Anthony Liguori 2012-01-03 15:48 ` Anthony Liguori 2012-01-03 22:31 ` Dor Laor 2012-01-03 22:31 ` Dor Laor 2012-01-03 22:45 ` Anthony Liguori 2012-01-03 22:45 ` [Qemu-devel] " Anthony Liguori 2012-01-03 22:59 ` Dor Laor [this message] 2012-01-03 22:59 ` Dor Laor 2011-12-27 3:15 ` [RFC PATCH 0/4] Gang scheduling in CFS Nikunj A Dadhania 2011-12-27 9:17 ` Avi Kivity 2011-12-27 9:44 ` Nikunj A Dadhania 2011-12-27 9:51 ` Avi Kivity 2011-12-27 10:10 ` Nikunj A Dadhania 2011-12-27 10:34 ` Avi Kivity 2011-12-27 10:43 ` Nikunj A Dadhania 2011-12-27 10:53 ` Avi Kivity 2011-12-30 9:51 ` Ingo Molnar 2011-12-30 10:10 ` Nikunj A Dadhania 2011-12-31 2:21 ` Nikunj A Dadhania 2012-01-02 4:20 ` Nikunj A Dadhania 2012-01-02 9:39 ` Avi Kivity 2012-01-02 10:22 ` Nikunj A Dadhania 2012-01-02 9:37 ` Avi Kivity 2012-01-02 10:30 ` Nikunj A Dadhania 2012-01-02 13:33 ` Avi Kivity 2012-01-04 10:52 ` Nikunj A Dadhania 2012-01-04 14:41 ` Avi Kivity 2012-01-04 14:56 ` Srivatsa Vaddagiri 2012-01-04 17:13 ` Avi Kivity 2012-01-05 6:57 ` Nikunj A Dadhania 2012-01-04 16:47 ` Rik van Riel 2012-01-04 17:16 ` Avi Kivity 2012-01-04 20:56 ` Rik van Riel 2012-01-04 21:31 ` Peter Zijlstra 2012-01-04 21:41 ` Avi Kivity 2012-01-05 9:10 ` Ingo Molnar 2012-02-20 8:08 ` Nikunj A Dadhania 2012-02-20 8:14 ` Ingo Molnar 2012-02-20 10:51 ` Peter Zijlstra 2012-02-20 11:53 ` Nikunj A Dadhania 2012-02-20 12:02 ` Srivatsa Vaddagiri 2012-02-20 12:14 ` Peter Zijlstra 2012-01-05 2:10 ` Nikunj A Dadhania 2011-12-19 15:51 ` Peter Zijlstra 2011-12-19 16:09 ` Alan Cox 2011-12-19 22:10 ` Benjamin Herrenschmidt 2011-12-20 1:56 ` Nikunj A Dadhania 2011-12-20 8:52 ` Jeremy Fitzhardinge
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