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

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

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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