From: Jens Axboe <axboe@suse.de>
To: Linux Kernel <linux-kernel@vger.kernel.org>
Subject: patch: blk-12
Date: Sat, 9 Dec 2000 18:35:56 +0100 [thread overview]
Message-ID: <20001209183556.G307@suse.de> (raw)
Hi,
I've released what will probably be the last blk-xx patch for 2.4, at
least as far as features go. In fact, blk-12 is just minor tweaks and
fixes over the previous version. Highlight of changes:
o Merge elevator merge and insertion scan. This saves an entire linear
queue scan when we can't merge a new buffer into the existing list.
o More fair merge accounting, actually take request size into account
when merging.
o Cleanup leftover cruft from previous elevator (nr_segments etc)
o Request queue aging.
o Batch freeing of requests. Stock kernels have very bad behaviour
under I/O load (load here meaning that the request list is empty,
doesn't require much effort...), because as soon as a request is
completed and put back on the freelist, a read/write will grab it
and the queue will be unplugged again. This effectively disables
elevator merging efforts completely. Note -- even though wakeups
of wait_for_request are now not a 1-1 mapping, wake-one semantics
are maintained.
o Fix sg indeterminate request completion time, due to scsi_insert_*
not providing guarentee of immediate queue run.
o Fix off by one ide-dma setup error
o Bump max request size from 64KB to 1MB, let low level drivers set
their own limits (eg IDE has 128KB hw limit). No need to limit
nice SCSI hardware, since during the data phase is where we get
full throttle.
o Remove silly s/390 double request get error
It's against 2.4.0-test12-pre7, and can be found here:
*.kernel.org/pub/linux/kernel/axboe/patches/2.4.0-test12-pre7/blk-12.bz2
--
* Jens Axboe <axboe@suse.de>
* SuSE Labs
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
next reply other threads:[~2000-12-09 18:06 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-12-09 17:35 Jens Axboe [this message]
2000-12-10 2:57 ` patch: blk-12 Andrew Morton
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20001209183556.G307@suse.de \
--to=axboe@suse.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox