4.8 ffs_dirpref problem

Ken Marx kmarx at vicor.com
Tue Oct 21 19:02:01 PDT 2003

Wow - quick reply. Thanks!

I dunno. Wasn't my idea.

I just quickly tried this: In the problem dirs it still bogs
down for about 20 seconds or so. I wish I could tell you
how long that was taking before, but I wasn't there for
that part, and I have to take off just now.

The systat -vmstat numbers look similar, but I don't
want to make any bold claims.

I'll re-disable soft updates, retest in the morning, and report back.

Thanks again,

David Rhodus wrote:
> On Tuesday, October 21, 2003, at 08:48 PM, Ken Marx wrote:
>> Hi,
>> We have 560GB raids that were sometimes bogging down heavily
>> in our production systems. Under 4.8-RELEASE (recently upgrated from 4.4)
>> we find that when:
>>     o the raid file system grows to over 85% capacity (with only
>>       30% inode usage)
>>     o we create ~1500 or so 2-6kb files in a given dir
>>     o (note: soft updates NOT enabled)
> I have one question, why do you have softupdates turned off ?
> With softupdates it could be possible to get faster writes than using
> an async mount.
> -DR

Ken Marx, kmarx at vicor-nb.com
They must reach agreement and stop beating around the bush on the long pole in 
the tent.
		- http://www.bigshed.com/cgi-bin/speak.cgi

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