2.4.10-ac10-preempt lmbench output.

From: safemode (safemode@speakeasy.net)
Date: Tue Oct 09 2001 - 19:36:56 EST

I'm very pleased so far with ac10 with the preempt patch. Much better than
2.4.9-ac18-preempt, which is what i was using. I'm just going to put up some
output from lmbench to see if anyone who is running the non-preempt version
is seeing better or worse timings and scores. Perhaps the improvement is
all in my head due to me moving my atapi devices off of the promise card
(since you're not supposed to put any on it) and now everything is generally
running faster despite the kernel being used. Heh. so here they are

(top of README says lmbench 2alpha8)
compiled without any changes to the Makefile (gcc 2.95.4)

Simple syscall: 0.3226 microseconds
Simple read: 0.8185 microseconds
Simple write: 0.5791 microseconds
Simple stat: 3.7546 microseconds
Simple open/close: 5.6581 microseconds
lat_fs (ext2)
0k 1000 36770 123993
1k 1000 15526 74383
4k 1000 15202 73692
10k 1000 9124 51972
FIFO latency: 8.0457 microseconds
Signal handler installation: 0.932 microseconds
Signal handler overhead: 2.852 microseconds
Protection fault: 0.761 microseconds
Pipe latency: 7.9139 microseconds
Pagefaults on /something.avi: 13098 usecs
Process fork+exit: 249.6818 microseconds
Process fork+execve: 298.0000 microseconds
Process fork+/bin/sh -c: 7883.0000 microseconds
AF_UNIX sock stream latency: 11.0054 microseconds
Select on 200 tcp fd's: 62.7955 microseconds
Select on 200 fd's: 18.5960 microseconds
Fcntl lock latency: 7.3516 microseconds
lat_ctx on an Eterm process
"size=0k ovr=2.82
"size=1024k ovr=301.96

That's all from lmbench2. Anyone without the preempt patch using the same
kernel care to compare? I'm very pleased.
Heavily io bound processes (dbench 32) still causes something as light as an
mp3 player to skip, though. That probably wont be fixed intil 2.5, since
you need to have preemption in the vm and the rest of the kernel.
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/

This archive was generated by hypermail 2b29 : Mon Oct 15 2001 - 21:00:28 EST