Also seeing 2 x quad-core system slower that 2 x dual core

Steven Hartland killing at
Fri Nov 30 04:12:10 PST 2007

sysctl -a |grep dirhash

Check vfs.ufs.dirhash_mem is not close to vfs.ufs.dirhash_maxmem if it is
and only most used boxes this seems to be the case increase maxmem.

Seems this could either do with an auto tune option or a larger max by
default in today's day and age.

----- Original Message ----- 
From: "Pete French" <petefrench at>
To: <freebsd-stable at>; <killing at>; <max at>
Sent: Friday, November 30, 2007 2:06 AM
Subject: Re: Also seeing 2 x quad-core system slower that 2 x dual core

>> Have you checked that your dir hash isn't suffering due to lack of memory
>> this can have a marked impact on seemingly trivial things like this as
>> could silly things like the RAID card being installed in a different slot.
> RAID card is onboard on these things - how would I check the dir hash ? The
> slower server has 16 gig of RAM, the faster one has 4 gig. Both were
> installed the same way in the same order, so should have the same disc layout
> more or less.
> -pete.

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