My configuration is two Dell Optiplex PCs ( /proc/cpuinfo attached)
connected back to back.. I am using the vanilla 2.6.14.3 kernel, and
using the e1000 driver for the onboard Intel PRO 1000 Ethernet Card on
both machines. I am performing both Full and Half Duplex Data
Transfer and the figures which I am getting are abysmal..
Full Duplex Data Transfer ( Both send and receive )
Ettcp Send - 55167.45 KB/sec
Ettcp Receive - 54902.49 KB/sec
Total Throughput ~ 110MB/sec
CPU IDLE - 55 percent
Half Duplex Data Transfer ( Sending from one host to another )
Total Throughput = 103 MB/Sec
CPU IDLE - 65 percent
Now, I assume that on Gigabit ethernet, I should be getting Line Rate,
which is around 220 MBps. Even the CPU is not getting max-ed out here
and I am at a loss to understand this behaviour.
Please find the ethtool dump, and the ettcp send and receive dumps for
both full and half duplex transfers
Regards,
Ashutosh
On 2/1/06, Ben Greear <[email protected]> wrote:
> Ashutosh Naik wrote:
> > Now, I assume that on Gigabit ethernet, I should be getting Line Rate,
> > which is around 220 MBps. Even the CPU is not getting max-ed out here
> > and I am at a loss to understand this behaviour.
>
> Make sure you are running 64-bit 100+Mhz PCI, otherwise you will not
> get line speed. ethtool -d [device]
> may get that info for you.
Thanks for that Ben. I now used a 64 bit,133 MHz PCI-X on both
machines and I got around 180 MBps, (86259.48 + 95164.90 ), which is
still a decent way away from Line speed. I think PCI is not a
bottleneck now, although I could be wrong. What could I be missing,
and has anybody seen line speed ( 220 MBps ) with e1000 ?
Regards and Thanks
Ashutosh
ps - Attaching my ettcp log