Nikos Vassiliadis wrote:
On Monday 24 September 2007 20:58, Artem Kuchin wrote:
What i don't understand is why timer rate on each cpu is 1995? I
have set it to 1000, not 1995 or 2000. I have seen it showing 2000
on another box.
So
1) why not 1000?
<DOUBLING>
I can only make assumptions about the doubling, and I don't want to.
FreeBSD is not a RTOS and some milliseconds variation is
understandable.
2) if it is supposed to be doubled (why?) when why not 2000?
I can only make assumptions about the doubling, and I don't want to.
FreeBSD is not a RTOS and some milliseconds variation is
understandable. </DOUBLING>
3) Is timer int really generated on each cpu?
Apparently, why do you doubt it?
Am i really wasting cpu
time on ~4000 ints per second?
You can lower it you know, if you feel that you are waisting
that much resources. Ofcourse you'll break your traffic flow
that way, since latency will increase.
You seem very upset about it, are you sure you want to use
polling(4)? it uses much more resources than interrupts.
I am not upset about all this. But i want to understand why is it
doubled. Because when i turn on polling i think that timer freq supposed
to be just like i set HZ. However, actually, i am now
thinking about another issue.
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. Did i really win anything?
I wish there were some good explanation on this.
4) does twe driver use polling? whay about twa? how to check it in
the sources?
Polling is only used on some network interface drivers. Polling(4)
does not offer generic device-polling facilities.
By the way, you know your post has an aggressive sense, don't you?
Please don't do this when asking questions and want replies.
Hmm.. Really? I didn't mean it, i was just trying to me as short and as
technical as possible. Alright, i'll give a though on how to be more..
polite, i guess.
--
Regards,
Artem
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