Re: [Xen-devel] [PATCH 0/5] Add MSI support to XEN

To:	"Jiang, Yunhong" <yunhong.jiang@xxxxxxxxx>, Espen Skoglund <espen.skoglund@xxxxxxxxxxxxx>, "Shan, Haitao" <haitao.shan@xxxxxxxxx>
Subject:	Re: [Xen-devel] [PATCH 0/5] Add MSI support to XEN
From:	Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date:	Mon, 31 Mar 2008 15:15:56 +0100
Cc:	"Tian, Kevin" <kevin.tian@xxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, "Li, Xin B" <xin.b.li@xxxxxxxxx>
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On 31/3/08 15:14, "Keir Fraser" <keir.fraser@xxxxxxxxxxxxx> wrote:

> I wonder whether there is a timing issue of some sort, and it depends if the
> NIC generates the software-triggered interrupt at a fast enough rate that the
> host CPU fails to make progress if it doesn't mask the MSI? You haven't
> changed test machine at all, or put the NIC in a different PCI slot, or
> anything like that?

Also, it's got to be worth kicking your hardware guys again and find out
from them exactly what happens when that software-triggered interrupt
register gets written by the device driver. Their previous response didn't
sound very enlightening.

 -- Keir

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