The other day I was running the stock fedora kernel on my ip
forwarding setup, to see what the performance was, and the performance
wasn't very good.
system is S5520HC dual socket 2.93GHz Xeon 5570 (Nehalem) with 3 quad
port 82580 adapters (12 ports). Traffic is bidirectional 64 byte
packets being forwarded and received on each port, basically port to
port routing. I am only using 12 flows currently.
The driver is igb, and I am using an affinity script that lines up
each pair of ports that are forwarding traffic into optimal
configurations for cache locality. I am also disabling
remote_node_defrag_ratio to stop cross node traffic.
With the fedora default kernel from F14 it appears that
CONFIG_NETFILTER=y means that I cannot unload all of netfilter even if
I stop iptables service.
perf showed netfilter being prominent, and removing it gives me much
higher throughput. Is there a reason CONFIG_NETFILTER=y ? Isn't it a
good thing to be able to disable netfilter if you want to?
I've prepared a git tree with the minimal sunxi-mmc support so that we
can properly get Fedora to run (headless) on Axx boards. You can
find the patch-set here:
This patch set looks larger then it really is as upstream wants the dts
bits cut into quite small patches.
This basically consists of 3 bits:
1) some sunxi-clk driver changes
2) a new sunxi-mmc.c file
3) dts bindings for the above
Note this only touches sunxi specific files. If I get no objections
the next few days I'm going to squash this all into one big sunxi-mmc
patch and add that to the rawhide kernel builds.
There's a gcc 4.9 bug right now that prevents the kernel from building
on ARM. Since ARM is a primary arch, it fails the build on x86_64 and
i686 as well. Until gcc is fixed, there won't be any new rawhide
kernels (unless I find a workaround).
I've done a scratch build of the next git snapshot kernel for i686 and
NOTE: That hasn't gone through any testing yet. I plan on testing it
in my usual setups tomorrow morning, and I'll report back after. I'm
just posting it now for the anxious and adventurous.