I'm working to port a cripto accelerating device driver(it's custom made
device) from linux (which works fine) to bsd (freebsd 7.1), but i couldn't get
the same(decent) results as for linux. The driver for linux and for bsd both a
started from the corresponding driver for geode LX cripo accelerator. I
concluded that it's not the device and the bottleneck is somewhere in the
kernel. I modified the original glxsb(geode crypto accelerator) driver and made
it return immediately after receiving a cripto task (so the device actually
does nothing aka device is taking zero time to cript any block of data) and the
data is actually not cripted. I made this for debugging purposes to see if the
kernel delivers enough data to the device. The netperf results between the two
exactly the same machines(with a tunnel(AES-CBC with HMAC_SHA256) between them)
with the exactly the same driver shows a throughput of maximum 20Mbps(without
IPSEC tunnel i can get 94,1 Mbps).
I've seen similar problems on some threads regarding VIA(which should work with
1,1 Gbps throughput).
I've tested the device not cripting network traffic (meaning "feed" the device
manually and give it data immediately after it finishes the previous) and i can
get a full speed of 117 Mbps(meaning it should be enough for my needs of
100Mbps NIC).
Does anybody have any better results on glxsb or via?(i mean a netperf test
between two machines) or there is a hack or a setting in the kernel or
somewhere else?
Any help is appreciated.
Thanks!
---------------
Vasile Marii
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