On 04/27/2010 08:05 AM, Gleb Natapov wrote:
On Tue, Apr 27, 2010 at 08:00:02AM -0500, Anthony Liguori wrote:
On 04/27/2010 06:11 AM, Gleb Natapov wrote:
Network cards have low number of rx/tx buffers interrupt. This is also
heuristic. Do you think driver should poll for this event instead and
NIC designers just wasted their time designing the feature?
I don't see how the two cases are at all similar.
They are the same. They send notification when resource is low.
More importantly, I don't see what the burden is of polling when
you're talking about a very unusual statistic that has a very
limited use case.
Poll is the wrong answer. Always. The statistic is very common and has
wide use case unless you have unlimited storage.
Every management tool does polling in some form. They'll poll CPU
stats, I/O stats, etc.
The typical use-case for overcommitting storage is using file backed
images. Using a dynamically growing LVM volume is almost certainly
unique to RHEV-M.
Regards,
Anthony Liguori
--
Gleb.
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