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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,


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