lkml.org 
[lkml]   [2006]   [May]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: wrong in_flight diskstat in 2.6.16.1
Jens Axboe wrote:
> On Tue, May 23 2006, Martin Devera wrote:
>> Hello,
>>
>> I see weird output from /sys/block/sd{a,b}/stat on our AMD64-X2 smp
>> machine with HT1000 (Broadcom) SATA with 2 WD 250GB HDDs in MD raid1. AS
>> scheduler was used, change to noop didn't change anything. It is vanilla
>> 2.6.16.1 and here are absolute values in hex and one second differences
>> below:
>>
>> 132CDF 56D62 61753C0 6966BC 165A8EB 5FF5B6C 3B32D6C0 1110594C FFCA89A4
>> FEE85878 49FF74E4
>> 132CDF 56D62 61753C0 6966BC 165A8EF 5FF5B6C 3B32D6E0 111059D0 FFCA89A1
>> FEE85C60 79291244
>> 0: 0
>> 1: 0
>> 2: 0
>> 3: 0
>> 4: 4
>> 5: 0
>> 6: 32
>> 7: 132
>> 8: -3
>> 9: 1000
>> 10: 791256416
>>
>> As you can see in_flight is constantly negative and it is DECREASING
>> slowly all the time.
>> I can't find any reason for it :-\
>
> Are you using io barriers?
>
> [PATCH] blk: fix gendisk->in_flight accounting during barrier sequence

I don't think so, I just used
mount / -o remount,barrier=0
to make it sure and it keeps decrementing. I'll however apply the patch
(and others up to 2.6.16.18) at night (I'm not allowed to restart the
machine just now).
thanks, Martin
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-05-23 11:33    [W:0.035 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site