Comments on: Zero-Copy in Linux with sendfile() and splice() http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/ Pat Patterson on the Cloud, Identity and Single Malt Scotch Thu, 23 May 2013 17:53:50 +0000 hourly 1 http://wordpress.org/?v=3.5.1 By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56563 Ron Wed, 25 Jul 2012 14:10:40 +0000 http://blog.superpat.com/?p=1071#comment-56563 Using sendfile syscall on client-side and read syscall on server-side… everything works fine.

]]> By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56507 Ron Tue, 24 Jul 2012 22:03:11 +0000 http://blog.superpat.com/?p=1071#comment-56507 What a temptation !!!

]]> By: Pat Patterson http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56504 Pat Patterson Tue, 24 Jul 2012 21:25:02 +0000 http://blog.superpat.com/?p=1071#comment-56504 Fall back to a traditional approach of reading the socket into a buffer and writing that buffer to the file?

]]> By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56501 Ron Tue, 24 Jul 2012 21:07:17 +0000 http://blog.superpat.com/?p=1071#comment-56501 I really dunno what to do at the moment

]]> By: Pat Patterson http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56498 Pat Patterson Tue, 24 Jul 2012 20:51:37 +0000 http://blog.superpat.com/?p=1071#comment-56498 Kernel 3.2? All bets are off – I was using 2.6 – I haven’t done anything with 3.x. Sorry!

]]> By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56496 Ron Tue, 24 Jul 2012 20:08:50 +0000 http://blog.superpat.com/?p=1071#comment-56496 Accordingly to my experiments, the big issue is related to splice syscall on server-side.

]]> By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56491 Ron Tue, 24 Jul 2012 19:48:17 +0000 http://blog.superpat.com/?p=1071#comment-56491 $ cat /proc/version

Linux version 3.2.0-27-generic-pae (buildd@akateko) (gcc version 4.6.3 (Ubuntu/Linaro 4.6.3-1ubuntu5) ) #43-Ubuntu SMP Fri Jul 6 15:06:05 UTC 2012

]]> By: Pat Patterson http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56486 Pat Patterson Tue, 24 Jul 2012 19:06:00 +0000 http://blog.superpat.com/?p=1071#comment-56486 Ron – yes – splice() is still a bit ‘bleeding edge’, I think. There might be bugs or idiosyncrasies in the kernel version you’re using.

]]> By: Ron http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56453 Ron Tue, 24 Jul 2012 12:32:59 +0000 http://blog.superpat.com/?p=1071#comment-56453 The client works fine sending to the server all the stuff from an input file. Added some code to print the content of my input file directly by the server.

Having, for example, a 16 byte file on client-side I got all the stuff on server-side and I can print such content.

The problem is with splice and so on, I guess.

]]> By: Pat Patterson http://blog.superpat.com/2010/06/01/zero-copy-in-linux-with-sendfile-and-splice/comment-page-1/#comment-56406 Pat Patterson Mon, 23 Jul 2012 22:34:06 +0000 http://blog.superpat.com/?p=1071#comment-56406 Ron – I can’t think what’s happening. You could send the file size, but you shouldn’t need to – the server should just read data from the socket until the client closes it. Good luck debugging tomorrow!

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