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SubjectRe: Linux 2.4.22-pre10
Hi Martin,

On Sat, Aug 02, 2003 at 11:42:50AM +0200, Martin Josefsson wrote:

> Have you tried using the ULOG target and the ulogd userspace daemon?
> It uses netlink and can batch several entries together before it sends
> them to userspace. Works a lot better than syslog.

yes, I tried it about february. I thought it to be the ideal solution, and it
performed better than the standard syslog, but not as well as syslog-ng. I
could catch about 1500 lines/s at most, and the daemon was very hungry, it ate
between 55 and 70% of the CPU, while syslog-ng eats about 25-30. So I thought
it was still a bit experimental and switched to syslog-ng.

> Are you using ip_conntrack on that machine? if you are, be aware that
> ip_conntrack doesn't scale well at all on SMP. It's beeing worked on.

Yes I do. I noticed the scalability problems a long time ago on my dual athlon
at home, but wasn't really concerned. At my customer's, the only SMP one is
used as a development gateway. All the others are UP (PIII/1G, P4/2.4G).

BTW, I get the same numbers with 2.4.22-pre10 / standard ip_conntrack as with
2.4.21-rc2 with tcp_window_tracking. I would have thought that
tcp_window_tracking costs a bit more, but it doesn't seem to be noticeable here.


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