Chelsio 10Gb Cards and iSCSI Offload

[kspare]

Is there any documentation on how to enable this and take advantage of the cpu offload?

 

[Ericloewe]

I don't know if they use it, but Chelsio on FreeBSD has no problem doing 10Gb/s. The bottleneck is almost always storage, with iSCSI, too.

 

[kspare]

They are supposed to!

 

[mav@]

There are two kinds of Chelsio cards. One kind is cheaper and supports only TSO/LRO offload, that is actually a lot. Other kind cost 2-3 times more, but also supports TCP (TOE) and iSCSI offload. I haven't yet experimented with recently implemented in FreeBSD iSCSI offload support, but as you can see from my BSDCan'2015 talk (http://www.bsdcan.org/2015/schedule/events/537.en.html) even with just TSO/LRO these cards can reach amazing speeds. TOE support additionally improves the situation up to the point when it is difficult to wish more -- 60Gbit/s and 1.24M IOPS.