From: Cacophonix <cacophonix@yahoo.com>
To: linux-mm@kvack.org
Subject: swapping from pagecache?
Date: Thu, 20 Apr 2000 14:07:32 -0700 (PDT) [thread overview]
Message-ID: <20000420210732.5417.qmail@web123.yahoomail.com> (raw)
Hello all,
I've been running a few webserver tests with 2.3.99-pre6-2, and there seems
to be some difference in behavior between 2.2.x and 2.3.99-pre.
Specifically, on 2.3.99, it appears that unused pages from the page cache
are swapped to disk, while in 2.2, unused pages are not swapped. As a result,
performance on 2.3.99-pre drops to below 2.2. levels under such a scenario.
For example, a procinfo on 2.3.99-pre6 reports:
Linux 2.3.99-pre6 (root@pc46) (gcc egcs-2.91.66) #8 Sun Apr 16 14:28:40 PDT
2000 1CPU [pc46]
Memory: Total Used Free Shared Buffers Cached
Mem: 513120 511220 1900 0 6280 442264
Swap: 265064 41984 223080
Bootup: Thu Apr 20 12:12:46 2000 Load average: 4.02 3.40 2.05 2/39 2287
user : 0:00:01.40 14.0% page in : 5191 disk 1: 62r 166w
nice : 0:00:00.01 0.1% page out: 904 disk 2: 1235r 0w
system: 0:00:04.65 46.5% swap in : 72
idle : 0:00:03.94 39.4% swap out: 787
uptime: 0:31:28.18 context : 2421
irq 0: 1000 timer irq 10: 1817 sym53c8xx
irq 1: 0 keyboard irq 11: 21 eth1
irq 2: 0 cascade [4] irq 12: 0 PS/2 Mouse
irq 3: 0 irq 13: 0 fpu
irq 4: 0 irq 15: 54620 NetGear GA620 Gigabi
Note that the value under shared is 0.
A procinfo under 2.2.16-pre1 with a similar scenario shows memory being
shared (mainly by the web server, which has an internal cache), and does
not swap at all.
Any comments on this behavior? (shm is mounted of course). Thanks for
any advice.
cheers,
karthik
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next reply other threads:[~2000-04-20 21:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-04-20 21:07 Cacophonix [this message]
2000-04-21 13:22 Mark_H_Johnson.RTS
2000-04-21 16:02 ` Rik van Riel
2000-04-22 17:10 Cacophonix
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