lkml.org 
[lkml]   [1998]   [Aug]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: wild imbalance in kswapd state
Date
From
> Has anyone actually verified whether or not the dcache is indeed a
> win on large news servers with 50-100 GB of disk at all?

This may be off optic a bit, but if you have such a big spool you are
strongly advised to use INN 2.1 and the storage API. With classic
spool directories become so huge that performance sucks big time,
dcache or not. (The most expensive operation is open(...,O_CREAT,...)
which _must_ traverse the whole directory, and the second is link()
which must do likewise, for each and every article received. You don't
fit 10,000+ complete directories in any dcache.)

Even the timehash storage is a big win over classical layout because
the directories it uses are smaller, the access pattern much more
well-behaved (only one directory gets written to at a time) so that
the dcache actually helps, and the links are unnecessary.

olaf


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.altern.org/andrebalsa/doc/lkml-faq.html

\
 
 \ /
  Last update: 2005-03-22 13:44    [W:0.060 / U:0.652 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site