David Daney wrote:
I am trying to port 2.6.12 to a 32 bit SOC (ATI Xilleon). The same
system is current running 2.4.29 with no problems.
I have an Intel Pro/100M Ethernet adapter on the PCI bus that I use to
mount the root file system via nfs. There is also an ohci usb adapter
on the bus.
My problem is that with my new 2.6.12 port the NFS is very slow. It
takes about 10 minutes to mount the root filesystem, run init and
finally run a shell on the serial port and present the shell prompt.
Running commands like 'ls' works but can take 15 seconds in a small
On the same hardware running 2.4.29 the system boots in 15 seconds and
there is no delay for the 'ls'.
One theory I have is that there is a problem in either the interrupt or
timer code somewhere. My evidence for this is that if I repeatedly plug
and unplug a usb memory device things run more quickly. I think the
interrupts from the USB may be kicking things into action.
Any pointers about where to look would be most appreciated.
Here is an update:
The CPU is a 32 bit MIPS 4Ke core (little endian).
My problem is only experienced with the drivers/net/e100.c driver. When
I use an RTL8100 with the 8139too driver the network seems to work fine.
The Intel driver reports to be:
e100: Intel(R) PRO/100 Network Driver, 3.4.8-k2-NAPI
I am just bringing the 2.6.12 kernel up on the board so it is quite
possible that I have screwed something up in the board specific portion
of the kernel.
When using the Intel Pro/100M NIC the network seems to work fine in all
respects except for the speed issue. If i run ping (either from the
board or to the board from an external host) I get round trip times of
almost exactly 1000mS.
With the same Intel NIC and the 2.4.29 kernel using the e100 driver I
have no problems, so I don't think it is a hardware issue.
Does anyone have any idea what would cause 1000mS delay?
Thanks in advance for any insight,