Anthony Liguori wrote:
Paul Brook wrote:
On Friday 03 October 2008, Ryan Harper wrote:
The default buffer size breaks up larger read/write requests
unnecessarily.
When we encounter requests larger than the default dma buffer,
reallocate
the buffer to support the request.
Allocating unboundedly large host buffers based on guest input seems
like a bad idea.
Perhaps they could be at least bound to phys_ram_size.
So the guest could double the memory load on the host with just one
request?!
In general, I don't think there's a correct size to bound them that's
less than phys_ram_size. The guest may be issuing really big IO
requests.
The correct fix is not to buffer at all but use scatter-gather. Until
this is done buffering has to be bounded.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
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