Date: Tue, 25 Sep 2007 12:49:10 +0300 From: Nikos Vassiliadis <nvass@teledomenet.gr> To: "Artem Kuchin" <matrix@itlegion.ru> Cc: freebsd-stable@freebsd.org Subject: Re: device polling and weird timer interrupt count from vmstat Message-ID: <200709251249.11287.nvass@teledomenet.gr> In-Reply-To: <00b801c7ff54$6796f2b0$0c00a8c0@Artem> References: <01ae01c7fd3e$e6ff28f0$0c00a8c0@Artem> <200709251048.20808.nvass@teledomenet.gr> <00b801c7ff54$6796f2b0$0c00a8c0@Artem>
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On Tuesday 25 September 2007 12:13, Artem Kuchin wrote: > I have dual CPU with HT. If i turn on HT (and it does help in my case) > it shoud 2000 int x4 = 8000 ints per second. SO, i have saved 200 > int/second from NIC and got myself 8000 ints/second from timer. This kind of load(200intrs/s) earns nothing from polling. > Did i > really win anything? I wish there were some good explanation on this. It would make a difference for let's say 8000 - 10000 interrupts/sec. You should read polling(4). It explains a lot:) HTH Nikos
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