On Sat, Apr 24, 2004 at 01:14:26PM -0500, Mike Silbersack wrote: > > On Sat, 24 Apr 2004, GiZmen wrote: > > > Hello, > > > > I am runnign freebsd 5.2.1 on 386 arch with two rl lan cards. My mainboard > > is on VIA KT 266A with AMD athlon 1.1. > > I read man polling and i have HZ=1000. My problem is that when i set up > > sysctl variable kern.polling.enable=1 my interrupts greatly increase. > > When my system is idle and indicate 0-1% interrupts with out polling. > > and when i turn on polling interrupts goes up to about 20% on idle system. > > Is it normal ? I never before use polling and i dont know that i have > > something bad in my system ? > > > > Can somebody explain me this ? > > > > thx > > -- > > Best Regards: > > GiZmen > > Ruslan can probably jump in and give you a better explanation than I can, > but I'll try to provide a quick answer. In short, the rl cards + driver > are not well suited to polling and will not work well with it enabled. > Support for polling on rl may in fact be removed as a result of this. > Well, basically, 8139's TX/RX engine is just not worth for use with polling(4). Now that we have per-interface polling(4) controls, I suggest that we leave it _disabled_ for rl(4) by default. My tests have shown that I could only get a comparable throughput with rl(4) given HZ=5000, which is *ahem* quite large to be really useful.
Cheers, -- Ruslan Ermilov [EMAIL PROTECTED] FreeBSD committer
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