From: Jens Axboe <axboe@suse.de>
To: Bartlomiej Zolnierkiewicz <B.Zolnierkiewicz@elka.pw.edu.pl>
Cc: Linus Torvalds <torvalds@transmeta.com>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] 2.5 ide 48-bit usage
Date: Thu, 8 May 2003 16:47:12 +0200 [thread overview]
Message-ID: <20030508144712.GB20941@suse.de> (raw)
In-Reply-To: <20030508133702.GC823@suse.de>
On Thu, May 08 2003, Jens Axboe wrote:
> > > Ditto, cannot be reliable without the taskfile changes.
> > >
> > > I won't bother with anything new until the taskfile stuff is in.
> >
> > Good decision.
>
> So what's the time frame on that?
And the more important question, how are you creating the taskfile? If
it's reachable from end_io context (and not just the submission path),
which it must be to solve the problem was are discussing here, then
surely it's not from the stack.
BTW, how about a minor compromise. See attached patch, I'd be happy with
that for now. It _is_ essentially two seperate issues, right? One is
getting good request sizes on 48-bit commands, the other is taking some
decent advantage of 48-bit commands.
diff -Nru a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c
--- a/drivers/ide/ide-disk.c Thu May 8 14:32:59 2003
+++ b/drivers/ide/ide-disk.c Thu May 8 14:32:59 2003
@@ -1479,7 +1483,7 @@
static int set_lba_addressing (ide_drive_t *drive, int arg)
{
- return (probe_lba_addressing(drive, arg));
+ return probe_lba_addressing(drive, arg);
}
static void idedisk_add_settings(ide_drive_t *drive)
@@ -1565,6 +1569,18 @@
}
(void) probe_lba_addressing(drive, 1);
+
+ if (drive->addressing == 1) {
+ ide_hwif_t *hwif = HWIF(drive);
+ int max_s = 2048;
+
+ if (max_s > hwif->rqsize)
+ max_s = hwif->rqsize;
+
+ blk_queue_max_sectors(&drive->queue, max_s);
+ }
+
+ printk("%s: max request size: %dKiB\n", drive->name, drive->queue.max_sectors / 2);
/* Extract geometry if we did not already have one for the drive */
if (!drive->cyl || !drive->head || !drive->sect) {
diff -Nru a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
--- a/drivers/ide/ide-probe.c Thu May 8 14:32:59 2003
+++ b/drivers/ide/ide-probe.c Thu May 8 14:32:59 2003
@@ -998,6 +998,7 @@
static void ide_init_queue(ide_drive_t *drive)
{
request_queue_t *q = &drive->queue;
+ ide_hwif_t *hwif = HWIF(drive);
int max_sectors = 256;
/*
@@ -1013,8 +1014,10 @@
drive->queue_setup = 1;
blk_queue_segment_boundary(q, 0xffff);
- if (HWIF(drive)->rqsize)
- max_sectors = HWIF(drive)->rqsize;
+ if (!hwif->rqsize)
+ hwif->rqsize = hwif->addressing ? 256 : 65536;
+ if (hwif->rqsize < max_sectors)
+ max_sectors = hwif->rqsize;
blk_queue_max_sectors(q, max_sectors);
/* IDE DMA can do PRD_ENTRIES number of segments. */
--
Jens Axboe
next prev parent reply other threads:[~2003-05-08 14:34 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-05-07 8:49 [PATCH] 2.5 ide 48-bit usage Jens Axboe
2003-05-07 16:28 ` Linus Torvalds
2003-05-07 16:46 ` Jens Axboe
2003-05-07 17:15 ` Linus Torvalds
2003-05-07 17:33 ` Jens Axboe
2003-05-07 17:42 ` Linus Torvalds
2003-05-07 17:50 ` Jens Axboe
2003-05-07 19:58 ` Bartlomiej Zolnierkiewicz
2003-05-07 20:19 ` Jens Axboe
2003-05-08 7:56 ` Jens Axboe
2003-05-08 11:01 ` Alan Cox
2003-05-08 12:01 ` Jens Axboe
2003-05-12 21:41 ` Mike Fedyk
2003-05-13 6:44 ` Jens Axboe
2003-05-08 11:34 ` Bartlomiej Zolnierkiewicz
2003-05-08 11:59 ` Jens Axboe
2003-05-08 12:20 ` Bartlomiej Zolnierkiewicz
2003-05-08 12:26 ` Jens Axboe
2003-05-08 12:36 ` Jens Axboe
2003-05-08 13:16 ` Bartlomiej Zolnierkiewicz
2003-05-08 13:23 ` Jens Axboe
2003-05-08 13:35 ` Bartlomiej Zolnierkiewicz
2003-05-08 13:37 ` Jens Axboe
2003-05-08 14:47 ` Jens Axboe [this message]
2003-05-08 14:51 ` Jens Axboe
2003-05-08 14:46 ` Alan Cox
2003-05-08 15:49 ` Bartlomiej Zolnierkiewicz
2003-05-08 16:16 ` Jens Axboe
2003-05-08 16:27 ` Linus Torvalds
2003-05-08 16:34 ` Jens Axboe
2003-05-08 16:59 ` Bartlomiej Zolnierkiewicz
2003-05-09 7:40 ` Jens Axboe
2003-05-08 22:06 ` Alan Cox
2003-05-09 7:06 ` Jens Axboe
2003-05-09 8:28 ` [PATCH][RFC] Sanitize hwif/drive addressing (was Re: [PATCH] 2.5 ide 48-bit usage) Jens Axboe
2003-05-09 11:07 ` Bartlomiej Zolnierkiewicz
2003-05-09 12:03 ` Jens Axboe
2003-05-07 21:45 ` [PATCH] 2.5 ide 48-bit usage Henning P. Schmiedehausen
2003-05-07 22:03 ` Alan Cox
2003-05-07 22:55 ` H. Peter Anvin
2003-05-07 18:29 ` Alan Cox
2003-05-07 19:30 ` Jens Axboe
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