If you find the time, the lastest v1.0.10 mod_http2 in 2.4.x sets the connection window to max which addresses for me the window starvation issues I was able to reproduce (and put into my test suite). I hope this works for you as well, otherwise I'd need more detailed data on how to reproduce the hanger.
//Stefan > Am 04.12.2015 um 10:50 schrieb Bert Huijben <b...@qqmail.nl>: > >> -----Original Message----- >> From: Stefan Eissing [mailto:stefan.eiss...@greenbytes.de] >> Sent: vrijdag 4 december 2015 10:18 >> To: dev@httpd.apache.org >> Subject: Re: No H2 Window updates! >> >> That is unfortunate. I added a test case which reproduced window >> exhaustion before I fixed it. What sort of requests do still miss window >> updates? content-length? response codes? > > I don't think we send content-length headers... (see older problem). I fixed > Subversion to always send Content-Type though. > > I'm going to add some more tracing to get the details again, but from what I > remember is that I had requests with 113 and 128 bytes +- over and over. > > [The tool experiencing this problem is a tool that tries to replicate some > behavior we can't express in Subversion yet. To implement this it asks the > server for similar things over and over. If we decide that we go this way we > would probably send one advanced request and get one response from the > server... But currently it is a nice tool to test the network IO limits :-)] > > These requests are always 1 HEADERS (/endofheaders) + 1 DATA (/eos) and the > response is not much either (Certainly less than 1 Kbyte, so probably just > HEADERS+1 DATA as well) > > > ---------------------- > Ok, added some logging back. > > I still don't see a lot of window updates, but I do see some. > > After my connection windows is slightly below 32767... I receive a single > connection window update to bring it back to exactly 32767. In all cases in > this log this update is < 100 bytes. (1 <= update < 256). > > But then I don't receive further window updates until my connection window > is almost depleted... And then I get another 255 bytes or so. Not enough to > get through the test. > > The log I just used is on: > https://lpt1.nl/f/2015/201512-NoWindow.txt > (Search for 'DBG: Connection window update' to find the updates between the > allocations) > > Bert >
