Polling slows down bandwidth

[Коньков Евгений]

Здравствуйте, Chuck.

Вы писали 28 октября 2010 г., 23:41:58:

CS> On Oct 28, 2010, at 1:21 PM, Коньков Евгений wrote:
>> [ ... ]

CS> What is "sysctl kern.clockrate", and have you increased kern.hz
CS> in /boot/loader.conf to at least 1000, if not 2000 or 4000?

# vmstat -i
interrupt                          total       rate
irq14: ata0                       193948          6
irq16: rl0                      42829515       1464
irq23: nfe0                     41224044       1409
cpu0: timer                     58494158       1999
irq256: igb0                      106911          3
irq257: igb0                      254606          8
irq258: igb0                           2          0
Total                          143103184       4892

# sysctl kern.clockrate
kern.clockrate: { hz = 1000, tick = 1000, profhz = 2000, stathz = 133 }

# sysctl kern.hz
kern.hz: 1000
but I have configured and installed kern with 2000HZ
"systat -v" shows that: 2002 cpu0: time


CS> Polling mode operation generally performs better when using older
CS> 100Mbs ethernet NICs which do not support interrupt mitigation and
CS> various capabilities like TSO4; gigabit ethernet NICs are smarter
CS> hardware and can generally outperform polling mode.
so using polling on gigabit NICs is a bottle neck? and is cause of low
performance, is not?





-- 
С уважением,
 Коньков                          mailto:kes-kes at yandex.ru