Andi Kleen wrote:
On Thu, Jan 31, 2008 at 10:26:19AM -0800, Rick Jones wrote:
Andi Kleen wrote:
TSO interacts badly with many queueing disciplines because they rely on
reordering packets from different streams and the large TSO packets can
make this difficult. This patch disables TSO for sockets that send over
devices with non standard queueing disciplines. That's anything but noop
or pfifo_fast and pfifo right now.
Does this also imply that JumboFrames interacts badly with these qdiscs?
Or IPoIB with its 65000ish byte MTU?
Correct. Of course it is always relative to the link speed. So if your
link is 10x faster and your packets 10x bigger you can get similarly
smooth shaping.
So, at what timescale do people using these qdiscs expect things to
appear "smooth?" 64KB of data at GbE speeds is something just north of
half a millisecond unless I've botched my units somewhere.
rick jones
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