Hi,
Very very sad to not receive any comments from dm maintainers
in the past 2 mouths. I implemented read-caching for v3 because
they like to see this feature in but no comment...
I still believe they reevaluate dm-writeboost because I don't
think this driver isn't bad as they claim.
They
To be clear, bio's semantics doesn't require a io is written on
persistent medium before any ack. The border line is that ios that's acked
are persitent before ack to REQ_FLUSH request.
So, writing on the volatile buffer (log chunk in this case) and then ack
is safe if the data gets persistent
On Sat, Feb 21, 2015 at 12:25:53AM +0900, Akira Hayakawa wrote:
Yes.
How big are your log chunks? Presumably they're relatively small (eg,
256k). In which case you can optimise for the common case where you
have enough bios to hand to build your log chunk by just referencing
the bio payloads,
The size is configurable but typically 512KB (that's the default).
Refer to bio payload sounds really dangerous but it may be possible
in some tricky way. but at the moment I am not sure how the
implementation would be.
Is there some fancy function that is like memcpy but actually move
the
On Sat, Feb 21, 2015 at 01:06:08AM +0900, Akira Hayakawa wrote:
The size is configurable but typically 512KB (that's the default).
Refer to bio payload sounds really dangerous but it may be possible
in some tricky way. but at the moment I am not sure how the
implementation would be.
Is
On Fri, Feb 20, 2015 at 05:44:01PM +0900, Akira Hayakawa wrote:
I will wait for ack from dm maintainers.
Are you still copying the contents of every bio to your own memory
buffer before writing it to disk?
- Joe
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On Thu, Jan 01, 2015 at 05:44:39PM +0900, Akira Hayakawa wrote:
This patch adds dm-writeboost to staging tree.
dm-writeboost is a log-structured SSD-caching driver.
It caches data in log-structured way on the cache device
so that the performance is maximized.
The merit of putting this
This patch adds dm-writeboost to staging tree.
dm-writeboost is a log-structured SSD-caching driver.
It caches data in log-structured way on the cache device
so that the performance is maximized.
The merit of putting this driver in staging tree is
to make it possible to get more feedback from
