From: Zlatko Calusic <zlatko.calusic@iskon.hr>
To: linux-kernel@vger.kernel.org
Cc: andrea@suse.de
Subject: Write throughput in >= 2.4.10
Date: 18 Oct 2001 21:13:13 +0200 [thread overview]
Message-ID: <87669c92ye.fsf@atlas.iskon.hr> (raw)
It looks like recent kernels have some serious trouble during simple
writing of files. Throughput is cut to half.
2.4.12-ac3 (Riel VM):
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
0 4 1 0 2548 7652 369104 0 0 0 21992 291 592 0 23 77
0 4 1 0 2556 7652 369104 0 0 0 22500 280 175 0 3 97
0 4 1 0 3064 7652 368588 0 0 8 19644 278 202 0 4 96
...
2.4.13-pre4 (Andrea/Linus VM):
procs memory swap io system cpu
r b w swpd free buff cache si so bi bo in cs us sy id
1 1 1 30312 2884 2304 384076 0 28 0 7784 199 241 0 12 88
0 1 1 30316 2068 2256 385772 0 132 4 7900 186 188 1 8 91
0 1 0 30316 3960 2232 384140 0 0 8 6744 179 204 0 4 96
...
'bo' column is the one to check out... I copied just 3 lines, but they
are all alike. 2.4.13-pre ends up with 11MB/sec, where -ac kernels are
over 20MB/sec (during sequential writing of big files - ext2 of course).
Also it looks like pre4 swaps when it is not necessary to do so. With
380MB in page cache I don't expect any swap traffic at all.
--
Zlatko
next reply other threads:[~2001-10-18 20:54 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-10-18 19:13 Zlatko Calusic [this message]
2001-10-18 19:36 ` Marcelo Tosatti
2001-10-18 21:26 ` Zlatko Calusic
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=87669c92ye.fsf@atlas.iskon.hr \
--to=zlatko.calusic@iskon.hr \
--cc=andrea@suse.de \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®