Kes, First, understand that the Realtek (re0) cards have significant network problems when trying to saturate a network. If you have the ability try switching to a Intel card (em0) for a lot better performance, lower interrupts and less CPU usage.
Why interrupts are not handled by more CPUs than one? This is probably the way the driver was built. It is a single processes which is using the "big lock" method. This keeps all activity for the drive bound to a single CPU core. or One CPU handle interrupts from one card, so I need two NICs?... Two nics would be a very good idea. You will see better performance a less IRQ splitting. Why it is lowered by twice? The CPU load is when the CPU is busy and can not be used by any other processes. This does _not_ mean that processing is going on, just that the CPU is unavailable. IRQ's are like locks and they keep the cpu from being use and hold on to the cpu. So, irq256 is holding onto the cpu, but not actually processing any data. This is not very efficient as you can see. Try changing cards to an Intel variety and use two nics in total; one for incoming connections and one for outgoing. On the network performace page we specify the cards we are currently using. Intel PRO/1000 GT PCI PWLA8391GT can be found on newegg for as little as $31 each. Hope this helps. -- Calomel @ https://calomel.org Open Source Research and Reference On Fri, Nov 18, 2011 at 02:41:15AM -0500, ??????? ??????? wrote: >Hi. > >FreeBSD 9.0-CURRENT FreeBSD 9.0-CURRENT #4: Fri Jun 10 01:30:12 UTC 2011 >:/usr/obj/usr/src/sys/PAE_KES i386 > > >I have some quiestions about FreeBSD tunig >https://calomel.org/network_performance.html > >I have re0 Gigabit Ethernet NIC(NDIS 6.0) (RTL8168/8111/8111c) and core i3 2100 >and two vlans on it: the one for incoming and the other for outgoing packets. > >#top -SIHP >last pid: 14902; load averages: 1.92, 2.12, 1.96 up 0+17:47:31 19:59:04 >226 processes: 12 running, 197 sleeping, 17 waiting >CPU 0: 0.6% user, 0.0% nice, 1.2% system, 88.3% interrupt, 9.8% idle >CPU 1: 1.8% user, 0.0% nice, 29.4% system, 0.0% interrupt, 68.7% idle >CPU 2: 3.7% user, 0.0% nice, 30.7% system, 0.0% interrupt, 65.6% idle >CPU 3: 3.1% user, 0.0% nice, 25.8% system, 0.0% interrupt, 71.2% idle >Mem: 264M Active, 1641M Inact, 272M Wired, 832K Cache, 112M Buf, 1721M Free >Swap: 4096M Total, 4096M Free > > PID USERNAME PRI NICE SIZE RES STATE C TIME WCPU COMMAND > 12 root -92 - 0K 152K CPU0 0 354:30 96.78% {irq256: re0} > 11 root 155 ki31 0K 32K RUN 1 929:16 77.83% {idle: cpu1} > 11 root 155 ki31 0K 32K RUN 3 922:41 72.95% {idle: cpu3} > 11 root 155 ki31 0K 32K RUN 2 904:02 71.63% {idle: cpu2} > 13 root -16 - 0K 32K CPU3 1 71:11 18.65% {ng_queue1} > 13 root -16 - 0K 32K RUN 1 71:10 18.36% {ng_queue3} > 13 root -16 - 0K 32K RUN 3 71:18 17.63% {ng_queue0} > 13 root -16 - 0K 32K RUN 1 71:11 17.14% {ng_queue2} > 11 root 155 ki31 0K 32K RUN 0 682:25 10.55% {idle: cpu0} >55709 root 20 0 13408K 5840K select 2 15:50 1.71% snmpd >14902 cacti 33 0 11960K 3480K select 1 0:00 1.12% snmpget >14864 cacti 46 0 11116K 2836K piperd 3 0:00 1.12% perl5.10.1 >14867 root 46 0 9728K 1956K select 3 0:00 1.12% sudo > >as you can see irq256 take all CPU0 time and packets that travel >through router have a lose about 5-10%, CPU100% loaded when trafic >achive 400Mbit/s and then lower as twice > >Now questions >1. Why interrupts are not handled by more CPUs than one? > >2. or One CPU handle interrupts from one card, so I need two NICs?... > >3. Why it is lowered by twice? > >Thank you. > >-- >? ?????????, > ??????? mailto:kes-...@yandex.ru _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"