Bodo Eggert wrote: > Kok, Auke <[EMAIL PROTECTED]> wrote: >> K.Prasad wrote: > >>> Without the side-effect of experiencing a link-flap when switching to a >>> lower-speed (with its toll in terms of down-time for auto-negotiation, >>> STP, etc), the Interrupt Moderation Algorithm dynamically adjusts the >>> number of interrupts based on traffic - and presumably consume less >>> power. For an "Optimise for Power" kind of profile - the driver can be >>> loaded with a higher throttle rate during boot-time. >> We're changing this to be run-time adjustable in newer drivers. >> >> However, the power consumed by your nic staying in gigabit mode is much >> greater in the long run then what you can save by trying to scrounge for >> milliwatts reducing interrupts generated by the nic. By default it already >> moderates them somewhat. Practically this feature is really not useful for >> powersaving, it just won't add up to actual benefits in a real life >> situtation >> I think. > > Just a thought: > How much power does a non-connected NIC consume, and can you save power > by forcing 10 MBit until a link is detected (doubling negotiation time)?
no, the PHY consumes a minimal amount of energy when not connected, regardless of whether it is advertising 10, 100 or 1000mbit. Cheers, Auke - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
