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Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】
From: |
Alex Williamson |
Subject: |
Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】 |
Date: |
Wed, 30 Aug 2017 10:43:04 -0600 |
On Wed, 30 Aug 2017 17:41:20 +0800
Bob Chen <address@hidden> wrote:
> I think I have observed what you said...
>
> The link speed on host remained 8GT/s until I finished running
> p2pBandwidthLatencyTest
> for the first time. Then it became 2.5GT/s...
>
>
> # lspci -s 09:00.0 -vvv
...
> LnkSta: Speed 8GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt-
So long as the device renegotiates to 8GT/s under load rather than
getting stuck at 2.5GT/s, I think this is the expected behavior. This
is a power saving measure by the driver. Thanks,
Alex
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, (continued)
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Michael S. Tsirkin, 2017/08/08
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Bob Chen, 2017/08/22
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Alex Williamson, 2017/08/22
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Michael S. Tsirkin, 2017/08/22
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Bob Chen, 2017/08/29
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Alex Williamson, 2017/08/29
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Bob Chen, 2017/08/30
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】,
Alex Williamson <=
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Bob Chen, 2017/08/07
- Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】, Alex Williamson, 2017/08/07