Hi, Thanks for the detailed reply!
* Maxim Dounin <[email protected]> wrote: <snip> > The 2147479552 is a limit applied by default to allow sendfile() > to work with larger files on Linux up to 2.6.16 (see > src/os/unix/ngx_linux_sendfile_chain.c for some comments). You can see the > same limit on the first sendfile() call in the Ubuntu log as well. Indeed, I had also seen a lot of reference to this "magic" number around, so I thought it might be related to it. > The strange thing here is that on Scientific Linux 6 the call > pretends it send all the bytes in a single non-blocking call. > This is not nginx expects to ever happen, and this is what causes > the problem to appear. It would be interesting to dig further to > understand what causes this SL6 behaviour. OK, I did write a tiny test program to try and reproduce the problem on the SL box: it tries to copy 4GB from an existing file in one sendfile call: https://gist.github.com/mathiasuk/cf46d0f0caf1dd597e59 As expected the sendfile calls return 2147479552, and the output file is indeed 2147479552 bytes long, so this seems to work. Here's the trace: https://gist.github.com/mathiasuk/694177cf6446428f9498 I wonder if this could be because my test uses an output file and not a socket. I'll try and investigate some more. > Using sendfile_max_chunk with some large value is a correct > workaround and expected to work fine. Thanks! Mathias _______________________________________________ nginx mailing list [email protected] http://mailman.nginx.org/mailman/listinfo/nginx
