Date: Wed, 16 Aug 2006 09:59:22 +0700 From: Bachilo Dmitry <root@solink.ru> To: freebsd-current@freebsd.org Subject: Re: throughput and interrupts Message-ID: <200608160959.23100.root@solink.ru> In-Reply-To: <20060815130002.M45647@fledge.watson.org> References: <200608151627.37828.root@solink.ru> <20060815130002.M45647@fledge.watson.org>
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В сообщении от Вторник 15 августа 2006 19:02 Robert Watson написал(a): > On Tue, 15 Aug 2006, Bachilo Dmitry wrote: > > I am completely stuck. I have a router, that rules three subnets. At > > first there were Allied Telesyn's netcards with realtek chipsets. I am > > using ipfw+natd and I had like 3,5 megabytes per second with 20 per cent > > of interrupt load. I had "discarded oversized frame" too often so I've > > replaced two main cards with 3Com 905 and now my xl0 and xl1 never > > discard frames. But I saw no speed boost and interrupts were also very > > high. I have discovered some IRQ conflicts and removed them, now I have > > single device per IRQ, but still i have near 20-30 % of interrupt load, > > when i download something through this router (and natd takes rest % of > > CPU). Some people advised me to use polling, so I've built kernel with > > HZ=1000, polling and tried it. Interrupts grew to 40-50% and speed > > decreased to 200-300 kb/s, so I had to turn the polling off. > > > > I just don't know what to try, to gain at least 9 mb/s, because this is > > what I get at home with the same cards, the same processor, with no > > polling and throgh the same provider. Oh, it's natd. Now I see, but I just don't get it. I know that natd is not efficient but, as I've said, at home I have 9 or almost 10 MB/sec through the natd, while at this particular server I see only 3,7 MB maximum. I've tried now to turn all the natting off and tried to download a file and got like 9 MB/sec, so it is natd who loads the system up. Someone advised me to use pf or ipnat, but I never did that before and heard that this nats have some limitations (like ipnat can't translate icmp packets or something). Furthermore I can't stop using ipfw, so pf is automaticly excluded. Maybe there are some more advises? I don't really want to have top performance with this router, I just want to raise it a bit, to at least stop loosing control on this router while someone is watching movie through it - ssh session becomes slow, so I type one letter per minute in this case. Well, if there is nothing I can do, I will stay with it, things are not that bad afterall :-) -- ------------------------ С уважением, Бачило Дмитрий Руководитель отдела системной интеграции ООО "Компания СоЛинк"help
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