Re: PCMCIA GigE adapters with jumbo frames

Scott W Gifford <gifford@xxxxxxxxx> wrote:
They will be talking through a switch with jumbo frames to a server
with jumbo frames; is that close enough?

So long as the switch's definiton of "jumbo frame" matches that of the
NICs on either end. There are some switches out there where "jumbo
frame" is not defined as a 9000 byte MTU.

Is PCMCIA/Cardbus/whatever it is called even fast enough to make the
CPU savings from JumboFrames interesting?

I believe the maximum theoretical bandwidth of PCMCIA Type II is
1056Mbps (33000 Hz x 32 bits), so the bus itself should be fast
enough to support full GigE speeds.

Weelll, that would imply one can run a bus at 1000/1056 or ~95%
utilization. One is doing really well (in broad handwaving terms)
getting an I/O bus to 80% utilization, and lower than 80% may not be
all that surprising.

And that math above does not include stuff like DMA setup latency, bus
turn-around events etc etc. So I'd be very pleasantly surprised to
see link-rate from a PCMCIA GigE NIC.

So, what is the CPU util and throughput you are seeing with the PCMCIA
cards you've used thusfar?

rick jones
--
The computing industry isn't as much a game of "Follow The Leader" as
it is one of "Ring Around the Rosy" or perhaps "Duck Duck Goose."
- Rick Jones
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...
.

Relevant Pages

  • Re: Jumbo Frames
    ... If NIC is available for Jumbo Frames, we can try to find a tools to test. ... Microsoft Online Partner Support ... The NIC is supported (I can adjust Jumbo Frames from the NICs control ... Windows Server 2003 supports Jumbo Frame for sure but it also ...
    (microsoft.public.windows.server.networking)
  • Re: Jumbo Frames
    ... The NIC is supported (I can adjust Jumbo Frames from the NICs control ... the NIC in use is support Jumbo Frame and if it is enabled. ... Second, when you said Gear, you mean NIC or Switch? ...
    (microsoft.public.windows.server.networking)
  • Re: http server
    ... you have to use multiple network cables... ... > do load balancing to another computer with many nics too, ... Well, the standard PCI bus is 32 bits wide, and runs at 33MHz. ... happy to get half that (over a Gbit connection). ...
    (comp.os.linux.networking)
  • Re: http server
    ... you have to use multiple network cables... ... > do load balancing to another computer with many nics too, ... Well, the standard PCI bus is 32 bits wide, and runs at 33MHz. ... happy to get half that (over a Gbit connection). ...
    (comp.os.linux.development.system)
  • Re: Conflicts found in /proc/interrupts
    ... Most NICs hate to share. ... > do many nvidia cards. ... 'usb-uhci' and placed in bus 4 gives a conflict with 'nvidia'. ...
    (Debian-User)