Re: [Qemu-devel] About virtio device hotplug in Q35! 【外域邮件.谨慎查阅】

[Alex Williamson]

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