Archive for June 22nd, 2008

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Network Driver Problem Solved

I ported STAR 9100 network driver without a documentation, I just blindly use the old driver and modify it to fit with all of the changes in the networking stuff since kernel 2.4.27. The driver claims to support scatter/gather I/O, but there is no implementation of scatter gather I/O in the hard_start_xmit function. I don’t know whether this device supports it or not, so I just change this line:

dev->features |= NETIF_F_SG|NETIF_F_IP_CSUM

to this:

dev->features |= NETIF_F_IP_CSUM

http://tinyhack.com/agestar/patch-2.6.25.4-for-agestar-20080622.bz2

And now the sendfile function works (although it would be faster if the driver supports scatter/gather IO).

Posted by yohanes on Jun 22nd 2008 | Filed in agestar, debian, hacks, linux | Comments (0)

Network driver is buggy, sendfile() syscall doesn’t work

I have concluded the source of failure for many applications is that the sendfile syscall on my port doesn’t work. To be precise, sendfile sends garbage data to the other side. I have an USB to Ethernet adapter, and using that adapter, the problem disappears. So the conclusion is that my network driver is buggy.

Applications that might be affected are: network servers that sends file (http servers, file servers, etc), distcc.

I will try to fix this tomorrow.

Posted by yohanes on Jun 22nd 2008 | Filed in agestar, hacks, linux | Comments (0)