Re^2: changing tcp parameters when establishing connection

Can setsockopt() be used to set or change the tcp window size or scaling factor under *nix?

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Comment on Re^2: changing tcp parameters when establishing connection

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Re^3: changing tcp parameters when establishing connection by Apero (Scribe) on Dec 02, 2015 at 20:53 UTC
Update: It turns out I was slightly mistaken below when I implied there's no way to tune window-scaling per-socket; ref tcp(7) (at least on my Linux and the link here) that indicates with kernel-level window-scaling enabled, tuning of the socket buffers do in fact impact the window scaling. As always, refer to your specific distro's system pages for particulars. /Update ~~No, at least not that I've seen; this said, maybe some exotic distro does support these specific features on a per-socket basis rather than per-host.~~ I was focusing on the "etc" part of OP's inquiry, suggesting an interest in tuning any socket-level options. The answer to such questions can only be found the OS-level manpages and resources for the target platform; these frequently reference additional resources, frequently noting the system-level knobs to which you referenced earlier. Perl's only as functional as the underlying OS, so sometimes use of advanced features in Perl require getting a bit "dirty" by digging into the system or C APIs.	[reply]

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Re^3: changing tcp parameters when establishing connection
by Apero (Scribe) on Dec 02, 2015 at 20:53 UTC

Update: It turns out I was slightly mistaken below when I implied there's no way to tune window-scaling per-socket; ref tcp(7) (at least on my Linux and the link here) that indicates with kernel-level window-scaling enabled, tuning of the socket buffers do in fact impact the window scaling. As always, refer to your specific distro's system pages for particulars. /Update

~~No, at least not that I've seen; this said, maybe some exotic distro does support these specific features on a per-socket basis rather than per-host.~~ I was focusing on the "etc" part of OP's inquiry, suggesting an interest in tuning any socket-level options.

The answer to such questions can only be found the OS-level manpages and resources for the target platform; these frequently reference additional resources, frequently noting the system-level knobs to which you referenced earlier.

Perl's only as functional as the underlying OS, so sometimes use of advanced features in Perl require getting a bit "dirty" by digging into the system or C APIs.

[reply]