Messages in this thread | | | Date | Sat, 2 Aug 2003 20:10:07 +0200 | From | Willy Tarreau <> | Subject | Re: Linux 2.4.22-pre10 |
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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.
Cheers, Willy
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