On Thu, Jun 14, 2018 at 02:20:29PM -0700, Guenter Roeck wrote: > On Thu, Jun 14, 2018 at 05:09:21PM -0400, Benjamin Gilbert wrote: > > Hi, > > > > 4.14.48 can cause abnormally small TCP receive windows when the sender is > > faster than the receiver; see https://github.com/coreos/bugs/issues/2457 for > > details. Reverting "tcp: avoid integer overflows in tcp_rcv_space_adjust()" > > fixes it. Backporting 02db55718d53 ("tcp: do not overshoot window_clamp in > > tcp_rcv_space_adjust()"), which is its parent commit upstream, also fixes > > it. > > > 02db55718d53 applies cleanly, so I would suggest we go along that route > instead of a revert. > > Greg - given that the problematic commit is in all stable releases, it would > probably make sense to apply 02db55718d53 to pre-4.14 kernels as well. It > does apply clean to all kernels all the way back to 3.18.y. Ah, but it breaks the build everywhere, so I've dropped it :( Can someone please backport it? I'll be glad to queue it up then. thanks, greg k-h
