Hi Navdeep,
On 06/13/10 08:33, Navdeep Parhar wrote:
Log:
cxgb(4): add knob to get packet timestamps from the hardware.
The T3 ASIC can provide an incoming packet's timestamp instead of its RSS
hash.
The timestamp is just a counter running off the card's clock. With a 175MHz
clock an increment represents ~5.7ns and the 32 bit value wraps around in
~25s.
# sysctl -d dev.cxgbc.0.pkt_timestamp
dev.cxgbc.0.pkt_timestamp: provide packet timestamp instead of connection
hash
# sysctl -d dev.cxgbc.0.core_clock
dev.cxgbc.0.core_clock: core clock frequency (in KHz)
# sysctl dev.cxgbc.0.core_clock
dev.cxgbc.0.core_clock: 175000
Is this really a "one or the other" feature, or is it technically
possible to support both simultaneously at some point in the future if
additional work was done?
Just curious...
Cheers,
Lawrence
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