I have a doubt in SF-104474-CD-33_Onload_User_Guide.pdf.

[h2cw2l]

Hello, onload team.

I am reading SF-104474-CD-33_Onload_User_Guide.pdf，I see the latency test results as follow: Let us focus on the last acceleration mode, Kernel, the latency is very lower in this mode. 1、Is this mode uses linux kernek net stack ? 2、As far as I know, the latency of Kernel is bigger than 12usec，I want to know waht lead to this lower latency ? Solarflare NICS ?

[rhughes-xilinx]

Hi there!

Yes, those "Kernel" numbers are using ordinary BSD sockets through the kernel stack, on a Solarflare X2522-25G NIC. The full hardware spec is given in section 2.4 of the doc. Note also the part of section 2.2 where it says that the NICs are running the ultra-low-latency firmware variant; this sacrifices (a small amount of) throughput for improved latency by removing various places where packets are normally batched.