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[Qemu-devel] Re: [PATCH RFC] virtio: put last seen used index into ring
From: |
Rusty Russell |
Subject: |
[Qemu-devel] Re: [PATCH RFC] virtio: put last seen used index into ring itself |
Date: |
Thu, 6 May 2010 12:01:34 +0930 |
User-agent: |
KMail/1.13.2 (Linux/2.6.32-21-generic; KDE/4.4.2; i686; ; ) |
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.
- [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Michael S. Tsirkin, 2010/05/05
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Avi Kivity, 2010/05/06
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Rusty Russell, 2010/05/06
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Avi Kivity, 2010/05/11
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Michael S. Tsirkin, 2010/05/11
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Rusty Russell, 2010/05/19
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Avi Kivity, 2010/05/19
- Re: [Qemu-devel] [PATCH RFC] virtio: put last seen used index into ring itself, Michael S. Tsirkin, 2010/05/19