Re: no luck with max_sectors_kb (Re: voluntary-preempt-2.6.8-rc2-J4)

[Ingo Molnar]

* Rudo Thomas <rudo@xxxxxxxxx> wrote:

> After setting it to 32 (the hw max is 128), userland programs fail
> with I/O errors. Setting it back to 128 gets it back to working, sort
> of. The errors probably get bufferred somewhere.
> 
> During the "bad" setting (32), messages like this one show up in kernel log.
> 
> bio too big device hda3 (104 > 64)

does the patch below, ontop of -J7, help?

	Ingo

--- drivers/block/ll_rw_blk.c.orig
+++ drivers/block/ll_rw_blk.c
@@ -2447,11 +2447,11 @@ end_io:
 			break;
 		}
 
-		if (unlikely(bio_sectors(bio) > q->max_sectors)) {
+		if (unlikely(bio_sectors(bio) > q->max_hw_sectors)) {
 			printk("bio too big device %s (%u > %u)\n", 
 				bdevname(bio->bi_bdev, b),
 				bio_sectors(bio),
-				q->max_sectors);
+				q->max_hw_sectors);
 			goto end_io;
 		}
 
-
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