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Re: [Xen-devel] DMA trouble with current xen-sparse


On 2 Nov 2005, at 15:59, Daniel Veillard wrote:

[root@localhost ~]# ethtool -K eth0 tso off
Cannot set device tcp segmentation offload settings: Operation not supported

  too bad ...
  with 'swiotlb=force swiotlb=8m' kernel parameters the box is stable,
without it very basic network access can crash it (say 'locate lib' over ssh)
and then the whole system reboots.

  100% reproductible for me, and without crazy hardware :-)

It'd be interesting to know what form of skbuffs get sent to the driver when this happens. e.g., how big is the skbuff data area, is the skbuff fragmented, etc.

 -- Keir


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