(please remove l-k from the Cc:, this ought to be sent to netdev)
Vladislav Bolkhovitin <[email protected]> :
>
> I've recently bought Realtek RTL8169S-32 chip based Gigabit Ethernet card:
>
> # lspci -vv
[...]
> I've noticed that all TX offload features (tx-checksumming,
> scatter-gather and TSO) are disabled by default and should be manually
> enabled by ethtool. I wonder, is there any particular reason for that?
As far as I can tell, it is mostly a lack of pressure from the users and
my desire to avoid a change of behavior.
> Why they are not enabled by default as it was done for e1000 or tg3? Are
> there any hidden drawbacks in enabling them?
None that I know of. I had not noticed a huge difference and people did
not comment a lot either...
> Those offload options are definitely work. They give in my setup (32-bit
> 66MHz PCI, Xeon 1.7GHz CPU, open-iscsi) CPU offload from 75% to 45% and
> data write throughput improvement from 55MB/s to 59MB/s.
...but your datapoint is welcome.
--
Ueimor
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