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Hi
I have a couple of questions - (Maybe this is the wrong list to post the =
question on, anyway.......)
1. What all code is actually part of the network "Interrupt Service =
Routine" proper? Is it all the stuff upto netif_rx ()??
2. Packets are being sent to a 266Mhz pII on a 100Mbps n/w. It has a 100 =
Mbps Dlink card using the via-rhine driver. Assuming that 1500 byte =
packets are being sent at the full rate of 100 Mbps, it would mean one =
1500 byte packet, and hence one interrupt every 0.12 ms Is that right?
Now, is the machine capable of servicing one interrupt in this much =
time? (Keeping in mind the first question - what code is part of the ISR =
??). Or is it that you can never utilise the full 100 Mbps bandwidth on =
machines ofthis speed?
3. How do I reliably measure time in the kernel? I want to know how much =
time the packet handler (net_bh() + packet_rcv ()) is taking. I tried =
printing "xtime" within a cli and sti, but it seems the time is not =
being updated very frequently.
Thanks
Akshay=20
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<DIV><FONT size=3D2>Hi</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>I have a couple of questions - (Maybe this is the =
wrong list=20
to post the question on, anyway.......)</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>1. What all code is actually part of the network =
"Interrupt=20
Service Routine" proper? Is it all the stuff upto netif_rx =
()??</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>2. Packets are being sent to a 266Mhz pII on a =
100Mbps n/w. It=20
has a 100 Mbps Dlink card using the via-rhine driver. Assuming that =
1500=20
byte packets are being sent at the full rate of 100 Mbps, it would mean =
one 1500=20
byte packet, and hence one interrupt every 0.12 ms Is that =
right?</FONT></DIV>
<DIV><FONT size=3D2>Now, is the machine capable of servicing one =
interrupt=20
in this much time? (Keeping in mind the first question - what code is =
part of=20
the ISR ??). Or is it that you can never utilise the full 100 Mbps =
bandwidth on machines ofthis speed?</FONT></DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>3. How do I reliably measure time in the kernel? I =
want to=20
know how much time the packet handler (net_bh() + packet_rcv ()) is =
taking.=20
I tried printing "xtime" within a cli and sti, but it seems the time is =
not=20
being updated very frequently.</FONT></DIV>
<DIV><FONT size=3D2></FONT> </DIV>
<DIV> </DIV>
<DIV><FONT size=3D2>Thanks</FONT></DIV>
<DIV><FONT size=3D2>Akshay</FONT> </DIV>
<DIV> </DIV></BODY></HTML>
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