Re: lmbench: 2.2.14pre4 vs. 2.3.29-pre3+syncwake

Matthew Wilcox (Matthew.Wilcox@genedata.com)
Mon, 22 Nov 1999 10:29:24 +0100


On Sun, Nov 21, 1999 at 09:44:31PM +0000, Jeff Garzik wrote:
> File & VM system latencies in microseconds - smaller is better
> --------------------------------------------------------------
> Host OS 0K File 10K File Mmap Prot Page
> Create Delete Create Delete Latency Fault Fault
> --------- ------------- ------ ------ ------ ------ ------- ----- -----
> i686-linu Linux 2.2.14p 15 1 26 1 7193 1 0.5K
> i686-linu Linux 2.2.14p 15 1 26 1 7243 1 0.5K
> i686-linu Linux 2.3.29s 15 1 26 2 785 1 0.0K
> i686-linu Linux 2.3.29s 16 1 26 2 801 1 0.0K

Looks like the base for page fault should be reset. If it were to display
513 vs 67 then it'd be more useful than 0.5k vs 0.0k. I haven't tested it,
but the patch below should do the job:

--- ./scripts/getsummary Fri Jul 31 21:55:19 1998
+++ ./scripts/getsummary-mrw Mon Nov 22 10:23:22 1999
@@ -387,7 +387,7 @@
&num($d10k, "%6d"),
$lat_mappings[$i],
&num($lat_protfault[$i], "%5d"),
- &num($lat_pagefault[$i]/1000, "%6.1fK");
+ &num($lat_pagefault[$i], "%5d");
}

print<<EOF;

-- 
Matthew Wilcox <willy@bofh.ai>
"Windows and MacOS are products, contrived by engineers in the service of
specific companies. Unix, by contrast, is not so much a product as it is a
painstakingly compiled oral history of the hacker subculture." - N Stephenson

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