From mboxrd@z Thu Jan  1 00:00:00 1970
From: Keir Fraser <keir.fraser@eu.citrix.com>
Subject: Re: [PATCH 0/5] Add MSI support to XEN
Date: Mon, 31 Mar 2008 15:15:56 +0100
Message-ID: <C416B0AC.1EA2C%keir.fraser@eu.citrix.com>
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To: "Jiang, Yunhong" <yunhong.jiang@intel.com>, Espen Skoglund <espen.skoglund@netronome.com>, "Shan, Haitao" <haitao.shan@intel.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>, xen-devel <xen-devel@lists.xensource.com>, "Li, Xin B" <xin.b.li@intel.com>
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On 31/3/08 15:14, "Keir Fraser" <keir.fraser@eu.citrix.com> 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