Re: udpated data logging available

[Chris Mason <mason@suse.com>]

On Thu, 2003-06-26 at 07:42, Dieter Nützel wrote:

> > Great to hear, thanks for giving it a try.  io-stalls-6 helped most when
> > you've got multiple devices and a streaming write to one was slowing
> > down all the others.  -7 added in a tweaked form of Andrea's elevator
> > latency fixes, and they make a big difference when there's a lot of
> > writes to the drive you're trying to read from.
> 
> So, does it apply to 2.4.21-aa1 (latest is 2.4.21rc8aa1) cleanly? ;-)
> 

No, io-stalls-7 is mostly in rc8aa1 already.  The major difference is
that andrea changed blk_finished_io and I added a new func to keep
compatibility for external drivers.  There are a few areas where he and
I chose different ways of doing things, if you're interested in helping
add some measurements to our debate, I can make you a patch against aa1.

> > Hopefully we'll be able to hash out something suitable for 2.4.22-pre.
> 
> 2.4.22-pre1 is out form some days...

Yes.  Almost all my latency testing was done on data logging + the jh-2
patch, so I'm much more confident now in that code.  Hopefully the
merging will start shortly, Oleg has a queue of things he wants to get
in, and we're trying to keep the rate of changes at something
manageable.

(quick clarification, io-stalls-7 is entirely unrelated to reiserfs, I
posted it here because I thought there might be some willing testers ;-)

-chris