From: Rusty Russell <rusty@rustcorp.com.au>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
qemu-devel@nongnu.org
Subject: Re: [PATCH RFC] virtio: put last seen used index into ring itself
Date: Thu, 6 May 2010 12:01:34 +0930 [thread overview]
Message-ID: <201005061201.35223.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20100505205814.GA7090@redhat.com>
On Thu, 6 May 2010 06:28:14 am Michael S. Tsirkin wrote:
> Rusty,
> this is a simplified form of a patch you posted in the past.
> I have a vhost patch that, using this feature, shows external
> to host bandwidth grow from 5 to 7 GB/s, by avoiding
> an interrupt in the window after previous interrupt
> was sent and before interrupts were disabled for the vq.
> With vhost under some external to host loads I see
> this window being hit about 30% sometimes.
Fascinating. So you use this to guess if the guest is still processing?
I haven't thought about it hard, but is that racy?
Obviously happy to apply this when you finalize it.
Thanks!
Rusty.
WARNING: multiple messages have this Message-ID (diff)
From: Rusty Russell <rusty@rustcorp.com.au>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: qemu-devel@nongnu.org, linux-kernel@vger.kernel.org,
kvm@vger.kernel.org, virtualization@lists.linux-foundation.org
Subject: [Qemu-devel] Re: [PATCH RFC] virtio: put last seen used index into ring itself
Date: Thu, 6 May 2010 12:01:34 +0930 [thread overview]
Message-ID: <201005061201.35223.rusty@rustcorp.com.au> (raw)
In-Reply-To: <20100505205814.GA7090@redhat.com>
On Thu, 6 May 2010 06:28:14 am Michael S. Tsirkin wrote:
> Rusty,
> this is a simplified form of a patch you posted in the past.
> I have a vhost patch that, using this feature, shows external
> to host bandwidth grow from 5 to 7 GB/s, by avoiding
> an interrupt in the window after previous interrupt
> was sent and before interrupts were disabled for the vq.
> With vhost under some external to host loads I see
> this window being hit about 30% sometimes.
Fascinating. So you use this to guess if the guest is still processing?
I haven't thought about it hard, but is that racy?
Obviously happy to apply this when you finalize it.
Thanks!
Rusty.
next prev parent reply other threads:[~2010-05-06 2:31 UTC|newest]
Thread overview: 96+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-05-05 20:58 [PATCH RFC] virtio: put last seen used index into ring itself Michael S. Tsirkin
2010-05-05 20:58 ` [Qemu-devel] " Michael S. Tsirkin
2010-05-05 21:18 ` Dor Laor
2010-05-05 21:18 ` [Qemu-devel] " Dor Laor
2010-05-05 21:18 ` Dor Laor
2010-05-06 2:31 ` Rusty Russell
2010-05-06 2:31 ` Rusty Russell [this message]
2010-05-06 2:31 ` [Qemu-devel] " Rusty Russell
2010-05-06 6:19 ` Michael S. Tsirkin
2010-05-06 6:19 ` Michael S. Tsirkin
2010-05-06 6:19 ` [Qemu-devel] " Michael S. Tsirkin
2010-05-07 3:33 ` Rusty Russell
2010-05-07 3:33 ` [Qemu-devel] " Rusty Russell
2010-05-07 3:33 ` Rusty Russell
2010-05-09 21:06 ` Michael S. Tsirkin
2010-05-09 21:06 ` Michael S. Tsirkin
2010-05-09 21:06 ` [Qemu-devel] " Michael S. Tsirkin
2010-05-06 10:00 ` [Qemu-devel] " Avi Kivity
2010-05-06 10:00 ` Avi Kivity
2010-05-07 3:23 ` Rusty Russell
2010-05-07 3:23 ` Rusty Russell
2010-05-07 3:23 ` Rusty Russell
2010-05-11 19:27 ` Avi Kivity
2010-05-11 19:27 ` Avi Kivity
2010-05-11 19:27 ` Avi Kivity
2010-05-11 19:52 ` Michael S. Tsirkin
2010-05-11 19:52 ` Michael S. Tsirkin
2010-05-11 19:52 ` Michael S. Tsirkin
2010-05-19 7:39 ` Rusty Russell
2010-05-19 7:39 ` Rusty Russell
2010-05-19 7:39 ` Rusty Russell
2010-05-19 8:06 ` Avi Kivity
2010-05-19 8:06 ` Avi Kivity
2010-05-19 22:33 ` Michael S. Tsirkin
2010-05-19 22:33 ` Michael S. Tsirkin
2010-05-20 6:04 ` Avi Kivity
2010-05-20 6:04 ` Avi Kivity
2010-05-20 6:04 ` Avi Kivity
2010-05-19 22:33 ` Michael S. Tsirkin
2010-05-20 5:01 ` Rusty Russell
2010-05-20 5:01 ` Rusty Russell
2010-05-20 5:01 ` Rusty Russell
2010-05-20 5:08 ` Rusty Russell
2010-05-20 5:08 ` Rusty Russell
2010-05-20 5:08 ` Rusty Russell
2010-05-23 15:31 ` Michael S. Tsirkin
2010-05-23 15:31 ` Michael S. Tsirkin
2010-05-23 15:31 ` Michael S. Tsirkin
2010-05-23 15:41 ` Avi Kivity
2010-05-23 15:41 ` Avi Kivity
2010-05-23 15:51 ` Michael S. Tsirkin
2010-05-23 15:51 ` Michael S. Tsirkin
2010-05-23 16:03 ` Avi Kivity
2010-05-23 16:03 ` Avi Kivity
2010-05-23 16:03 ` Avi Kivity
2010-05-23 16:30 ` Michael S. Tsirkin
2010-05-23 16:30 ` Michael S. Tsirkin
2010-05-24 6:37 ` Avi Kivity
2010-05-24 6:37 ` Avi Kivity
2010-05-24 6:37 ` Avi Kivity
2010-05-24 8:05 ` Michael S. Tsirkin
2010-05-24 8:05 ` Michael S. Tsirkin
2010-05-24 8:05 ` Michael S. Tsirkin
2010-05-24 11:00 ` Avi Kivity
2010-05-24 11:00 ` Avi Kivity
2010-05-24 11:00 ` Avi Kivity
2010-05-23 16:30 ` Michael S. Tsirkin
2010-05-23 17:28 ` Michael S. Tsirkin
2010-05-23 17:28 ` Michael S. Tsirkin
2010-05-23 17:28 ` Michael S. Tsirkin
2010-05-23 15:51 ` Michael S. Tsirkin
2010-05-23 15:41 ` Avi Kivity
2010-05-23 15:56 ` Michael S. Tsirkin
2010-05-23 15:56 ` Michael S. Tsirkin
2010-05-23 15:56 ` Michael S. Tsirkin
2010-05-20 7:00 ` Avi Kivity
2010-05-20 7:00 ` Avi Kivity
2010-05-20 7:00 ` Avi Kivity
2010-05-20 14:34 ` Rusty Russell
2010-05-20 14:34 ` Rusty Russell
2010-05-20 14:34 ` Rusty Russell
2010-05-20 15:46 ` Avi Kivity
2010-05-20 15:46 ` Avi Kivity
2010-05-20 15:46 ` Avi Kivity
2010-05-20 10:04 ` Michael S. Tsirkin
2010-05-20 10:04 ` Michael S. Tsirkin
2010-05-20 10:04 ` Michael S. Tsirkin
2010-05-07 3:23 ` Rusty Russell
2010-05-06 10:00 ` Avi Kivity
2010-05-11 18:46 ` Ryan Harper
2010-05-11 18:46 ` [Qemu-devel] " Ryan Harper
2010-05-11 19:48 ` Michael S. Tsirkin
2010-05-11 19:48 ` [Qemu-devel] " Michael S. Tsirkin
2010-05-11 19:48 ` Michael S. Tsirkin
2010-05-11 18:46 ` Ryan Harper
-- strict thread matches above, loose matches on Subject: below --
2010-05-05 20:58 Michael S. Tsirkin
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