On Sat, Feb 21, 2015 at 09:53:45AM -0800, Sage Weil wrote:
Ah, thanks. I guess in the buffered case though we won't block normally
anyway (unless we've hit the bdi dirty threshold). So it's probably
either aio direct or buffered write + aio fsync, depending on the cache
hints?
buffered
On Thu, Feb 19, 2015 at 03:50:45PM -0800, Sage Weil wrote:
- assemble the transaction
- start any aio writes (we could use O_DIRECT here if the new hints
include WONTNEED?)
Note that kernel aio only is async if you specifiy O_DIRECT, otherwise
io_submit will simply block.
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On Sat, 21 Feb 2015, Christoph Hellwig wrote:
On Thu, Feb 19, 2015 at 03:50:45PM -0800, Sage Weil wrote:
- assemble the transaction
- start any aio writes (we could use O_DIRECT here if the new hints
include WONTNEED?)
Note that kernel aio only is async if you specifiy O_DIRECT,
So cool!
A little notes:
1. What about sync thread in NewStore?
2. Could we consider skipping WAL for large overwrite(backfill, RGW)?
3. Sorry, what means [aio_]fsync?
On Fri, Feb 20, 2015 at 7:50 AM, Sage Weil sw...@redhat.com wrote:
Hi everyone,
We talked a bit about the proposed KeyFile
On Fri, 20 Feb 2015, Haomai Wang wrote:
So cool!
A little notes:
1. What about sync thread in NewStore?
My thought right now is that there will be a WAL thread and (maybe) a
transaction commit completion thread. What do you mean by sync thread?
One thing I want to avoid is the current
OK, I just viewed part of codes and realized it.
It looks like we want to sync metadata each time when WAL and we ahead
do_transaction jobs before WAL things. It may cause larger latency
than before? Because the latency of do_transactions couldn't be simply
ignore under some latency sensitive
On 02/20/2015 09:00 AM, Sage Weil wrote:
On Fri, 20 Feb 2015, Haomai Wang wrote:
So cool!
A little notes:
1. What about sync thread in NewStore?
My thought right now is that there will be a WAL thread and (maybe) a
transaction commit completion thread. What do you mean by sync thread?
Hi everyone,
We talked a bit about the proposed KeyFile backend a couple months back.
I've started putting together a basic implementation and wanted to give
people and update about what things are currently looking like. We're
calling it NewStore for now unless/until someone comes up with a
