Messages in this thread | | | From | "John Hawkes" <> | Subject | Re: [PATCH] 2.5: push BKL out of llseek | Date | Fri, 1 Feb 2002 11:29:11 -0800 |
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From: "Dave Jones" <davej@suse.de> > did you benchmark with anything other than dbench ?
I've done substantial AIM7 benchmarking on a 28p ia64 NUMA system, and llseek's BKL usage is a significant contributor to poor scaling. For 500 AIM7 "tasks" and ext2 filesystems, waiting on the BKL consumes about half of the available CPU cycles, and sys_lseek()'s usage is the most significant cycle waster, followed by ext2_get_block() and ext2_write_inode(). Anton's llseek patch from last November does make a measurable improvement in AIM7 throughput.
-- John Hawkes hawkes@sgi.com
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