On Wed, Oct 31, 2007 at 05:00:16PM -0500, Kiyoshi Ueda wrote:
> How about the case that other dm device is stacked on the dm device?
> (e.g. dm-linear over dm-multipath over i2o with bounce_pfn=64GB, and
> the multipath table is changed to i2o with bounce_pfn=1GB.)
Let's not broaden the pro
Hi,
On Wed, 31 Oct 2007 08:36:01 +0100, Hannes Reinecke <[EMAIL PROTECTED]> wrote:
> Vasily Averin wrote:
> > Alasdair G Kergon wrote:
> >> So currently we treat bounce_pfn as a property that does not need to be
> >> propagated through the stack.
> >>
> >> But is that the right approach?
> >> - Is
Vasily Averin wrote:
> Alasdair G Kergon wrote:
>> So currently we treat bounce_pfn as a property that does not need to be
>> propagated through the stack.
>>
>> But is that the right approach?
>> - Is there a blk_queue_bounce() missing either from dm or elsewhere?
>> (And BTW can the bio_alloc()
Alasdair G Kergon wrote:
> So currently we treat bounce_pfn as a property that does not need to be
> propagated through the stack.
>
> But is that the right approach?
> - Is there a blk_queue_bounce() missing either from dm or elsewhere?
> (And BTW can the bio_alloc() that lurks within lead to d
On Wed, Oct 31, 2007 at 02:01:33AM +, Alasdair G Kergon wrote:
> What if you swap in alternative dm targets, e.g. if it's linear,
> try multipath (round-robin, one path)?
And try using md instead of dm - does that also show the problem?
(md takes a similar stance to dm on this I believe.)
A
On Tue, Oct 30, 2007 at 11:26:17PM +, Alasdair G Kergon wrote:
> ) DM doesn't need to bounce bio's on its own, but the block layer defaults
> ) to that in blk_queue_make_request(). The lower level drivers should
> ) bounce ios themselves, that is what they need to do if not layered below
> ) dm
On Tue, Oct 30, 2007 at 01:11:38PM -0700, Andrew Morton wrote:
> On Mon, 29 Oct 2007 09:31:39 +0300
> Vasily Averin <[EMAIL PROTECTED]> wrote:
> > Device mapper uses its own bounce_pfn that may differ from one on underlying
> > device. In that way dm can build incorrect requests that contain sg ele
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