[vlc-devel] [PATCH] network: export SO_RCVBUF & SR_SNDBUF as config options

Tzu-Jung Lee roylee17 at gmail.com
Thu Aug 15 14:37:33 CEST 2013

Hi Remi,

On Tue, Aug 13, 2013 at 2:44 AM, Tzu-Jung Lee <roylee17 at gmail.com> wrote:
> Hi Steinar,
> On Tue, Aug 13, 2013 at 1:40 AM, Steinar H. Gunderson
> <sgunderson at bigfoot.com> wrote:
>> On Tue, Aug 13, 2013 at 01:31:00AM +0800, Tzu-Jung Lee wrote:
>>> This patch allows user to overrite default values set by VLC on our
>>> Linux system, though I haven't managed to build a Windows version
>>> and give it a try.
>> Note that in some cases, you actually want to _reduce_ this value from the
>> default, so that the burst size becomes smaller.
> I believe it's case by case :-). And that's why I think it make sense
> to export them
> as configs.
>> The default for VLC (at least on Linux) should simply be to leave it alone,
>> though, as Linux has socket buffer size auto-tuning these days.
> Leave it alone for Linux probably will be fine since we can still manipulate the
> system-wise default values if we have to.
> The setsocketopt is portable, and work for windows platforms where I can't find
> equivalent system-wise settings. A MaxDgramBuffering is available for
> 'sending' packets,
> but no such settings for receiving packets. We experience packet loss
> badly on windows platform.
> We did some experiments with IPERF and NC on Win 7, and found the that
> with a 512 KB RCVBUF,
> packets are dropped from time to time even when the bit-rate is 1MBps low.
> (I haven't managed to build a Windows version of VLC with a larger
> buffer for verification though.)

Any comments or suggestions on this?



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