Re: speed difference between using hard-linked and modular drives?

• Next message: Ingo Molnar: "Re: [patch] scheduler cache affinity improvement for 2.4 kernels"
• Previous message: Andrew Morton: "Re: [Ext2-devel] ext2/ialloc.c cleanup"
• In reply to: Andrew Morton: "Re: speed difference between using hard-linked and modular drives?"
• Next in thread: David S. Miller: "Re: speed difference between using hard-linked and modular drives?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

   From: Andrew Morton <akpm@zip.com.au>
   Date: Thu, 08 Nov 2001 23:16:08 -0800
   
   Well on my setup, there are more hash buckets than there are
   pages in the system. So - basically empty. If memory serves
   me, never more than two pages in a bucket.

Ok, this is what I expected. The function is tuned for
having N_HASH_CHAINS being roughly equal to N_PAGES.

If you want to experiment with smaller hash tables, there
are some hacks in the FreeBSD sources that choose a different "salt"
per inode. You xor the salt into the hash for each page on that
inode. Something like this...

Franks a lot,
David S. Miller
davem@redhat.com
-
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/

• Next message: Ingo Molnar: "Re: [patch] scheduler cache affinity improvement for 2.4 kernels"
• Previous message: Andrew Morton: "Re: [Ext2-devel] ext2/ialloc.c cleanup"
• In reply to: Andrew Morton: "Re: speed difference between using hard-linked and modular drives?"
• Next in thread: David S. Miller: "Re: speed difference between using hard-linked and modular drives?"
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

This archive was generated by hypermail 2b29 : Thu Nov 15 2001 - 21:00:21 EST