TSO

[John-Mark Gurney]

Sami Halabi wrote this message on Wed, Feb 26, 2014 at 19:37 +0200:
> I'm reading (almost) all mailing emails in mailig list...
> 
> Almost every / many problem in network performancr / packets loss ended up
> suggesting disabling TSO.
> 
> I wonder why.. Is it a bug in the implementation? Or bybdesign?
> What are the usecases that TSO is needed? Myabe  it should be disabled bt
> default?

It looks like most of the problems are in drivers that don't handle
packets with a large number of segments properly...  The problem is
that some drivers limit to how segments a packet can be broken into, and
then if they receive such a packet, instead of doing their darnest to
deliver it, they drop it...

There are some patches that help address the issue...

Drivers should complain more loudly when a packet gets dropped by the
driver, since it is likely that the OS may retry the same packet,
just to have it fail, though sometimes it'll try a different set, and
it might go through, so all the user may notice is a slight lag if
they notice anything at all...

-- 
  John-Mark Gurney				Voice: +1 415 225 5579

     "All that I will do, has been done, All that I have, has not."