(4.8/amd64) Hello,
I'm using two ethernet cards Intel 1000/PRO quad ports (gigabit) on a firewall (one fiber and one copper). The problem is that we don't get more than ~320 Mbits/s of bandwith beetween the internal networks and internet (gigabit). As far I can see, on load there is a number of "Ierr" on the interface connected to Internet (between 1% to 5%). Also the interrupt rate on this card is around ~7500 (using systat). In the em(4) driver, there is a limitation of the interrupt rate at 8000/s. if_em.h /* * MAX_INTS_PER_SEC (ITR - Interrupt Throttle Register) * The Interrupt Throttle Register (ITR) limits the delivery of interrupts * to a reasonable rate by providing a guaranteed inter-interrupt delay * between interrupts asserted by the Ethernet controller. */ #define MAX_INTS_PER_SEC 8000 Do you think I can increase this value? The interrupt rate of the machine is at max ~60% (top). Other ideas to increase the bandwith would be welcome too. I don't think the limitation come from PF because I don't see any congestion. thanks, regards. ------ dmesg: em0 at pci5 dev 0 function 0 "Intel PRO/1000 QP (82571EB)" rev 0x06: apic 1 int 13 (irq 14), address 00:15:17:ed:98:9d em4 at pci9 dev 0 function 0 "Intel PRO/1000 QP (82575GB)" rev 0x02: apic 1 int 23 (irq 11), address 00:1b:21:38:e0:80
