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Subject: Re: iostats broken for devices with major number > DK_MAX_DISK (16)
From: James Stevenson <james@stev.org>
To: Per Andreas Buer <perbu@linpro.no>
Cc: linux-kernel@vger.kernel.org
In-Reply-To: <PERBUMSGID-ul64ramh6g5.fsf@nfsd.linpro.no>
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On Tue, 2002-11-12 at 20:35, Per Andreas Buer wrote:
> Hi,
> 
> sorry for the intrusion. I noticed iostats didn't display statistics for
> devices on Mylex RAID constrollers. Det statistics are completely
> missing in /proc/stat. The reason seems to be an assumption that disks
> have major numbers which are below 16
> (http://lxr.linux.no/source/include/linux/kernel_stat.h#L15) which is
> used by http://lxr.linux.no/source/fs/proc/proc_misc.c#L344.
> 
> Devices on Mylex-controllers have major number 48. Would it break
> anything if DK_MAX_MAJOR if set higher (e.g. 64)?
> 
> AFAIK this goes for both 2.4 and the 2.5 series.

i have been runing with 2.4.x kernel with this number
set higher i have still yet to see any problem with it
other than using more memory.


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