Re: 2.4.22pre6aa1

From: Marc-Christian Petersen (
Date: Tue Jul 22 2003 - 08:34:16 EST

On Friday 18 July 2003 00:50, Andrea Arcangeli wrote:

Hi Andrea,

> Can you try to change include/linux/blkdev.h like this:
> -#define MAX_QUEUE_SECTORS (4 << (20 - 9)) /* 4 mbytes when full sized */
> +#define MAX_QUEUE_SECTORS (16 << (20 - 9)) /* 4 mbytes when full sized */
> This will raise the queue from 4 to 16M. That is the first(/only) thing
> that can explain a drop in performnace while doing contigous I/O.
> However I didn't expect it to make a difference, or at least not so
> relevant.
> If this doesn't help at all, it might not be an elevator/blkdev thing.
> At least on my machines the contigous I/O still at the same speed.
well, it doesn't help at all. I/O gets more worse with that change. (8mb/s
less). How can this happen? *wondering*

> You also where the only one reporting a loss of performance with
> elevator-lowlatency, it could be still the same problem that you've
> seen at that time.
The only one? Surely not. Also Con tested your elevator-lowlatency and we both
saw performance degration :)

> can you try with data=writeback (or ext2) or hdparm -W1 and see if you
> can still see the same delta between the two kernels? (careful with -W1
> as it invalidates journaling)
Yes, I'll do it later this day.

Sorry for my late reply. I've been very busy.

ciao, Marc

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

This archive was generated by hypermail 2b29 : Wed Jul 23 2003 - 22:00:46 EST