Re: [Xen-users] tap:aio not working...

[Kevin Wolf <kwolf@xxxxxxx>]

Nick Couchman schrieb:
> xen02:~ # lsmod | grep -i tap
> blktap                121604  2 [permanent]
> xenbus_be               8832  3 netbk,blkbk,blktap
> xen02:~ # ps -ef | grep blk
> root      7060     1  0 Apr28 ?        00:00:00 blktapctrl
> root     31500 31466  0 06:59 pts/0    00:00:00 grep blk
>
> Clearly the blktap module is loaded (is there another one I need??) and the control daemon is running. 
Looks right so far.

> The only messages that I get with BLKTAP or TAPDISK occur when I manually do an "xm block-attach" to dom0 to test out the tap:aio method. 
So if you try to block-attach the image to Dom0 it works and the problem 
is only with DomU? Unfortunately I currently don't have a machine 
installed with SP1 here, it's all the SP2 RCs now.
Looking at my own logfiles I found that I get this "blkback: ring-ref" 
lines only when I use file. With blktap it doesn't show up at all. So 
the information that you wanted blktap might have been lost somewhere in 
the middle of the domain startup. This would also explain the missing 
BLKTAP and TAPDISK lines.
Kevin

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