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Re: [Qemu-devel] [PATCH 0/4] qcow2: Improve cluster refcount update


From: Avi Kivity
Subject: Re: [Qemu-devel] [PATCH 0/4] qcow2: Improve cluster refcount update
Date: Sun, 09 Nov 2008 16:35:34 +0200
User-agent: Thunderbird 2.0.0.16 (X11/20080723)

Anthony Liguori wrote:
Laurent Vivier wrote:
Le vendredi 07 novembre 2008 à 07:59 -0600, Anthony Liguori a écrit :
  In all cases #1 is totally useless as it is only cosmetic.

#2 improves performance without aligned buffers and with "cache" set to
default value.

I'm currently rewriting the block-raw-posix.c O_DIRECT support. I'll commit your patches once I finish that.

I'm switching everything to use the aio functions, introducing a memory pool so that we can efficiently allocate memory for new requests without having unbounded memory allocation, and switching all the synchronous functions to use the aio functions.

What about locking? If clusters are already allocated and we don't need COW things are simple (and a global lock should suffice, provided it's released before the io is actually submitted), but are you planning to parallelize the metadata paths as well?

--
error compiling committee.c: too many arguments to function





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