On 7/21/08, Vlad Yasevich <vladislav.yasevich@xxxxxx> wrote: > leon zadorin wrote: >> Hi all, >> my system is >> 2.6.23.1-42.fc8 #1 SMP x86_64 x86_64 x86_64 GNU/Linux >> as I understand it - it comes with the kernel that is already >> sctp-enabled... (in fact I am able to create sctp sockets and >> communicate data between them). >> >> I have a question wrt ability of finding the amount of 'free space' in >> the SND buffer associated with a givent sctp socket's fd (the actual >> buffering strategy [single buffer per association or not] is not >> important to me - only the fact that eventually any message written >> via an SCTP socket will have to go to some kernel-level buffer - and I >> want to know the amount of free space left in such a buffer before >> actually writing the message). >> >> Essentially I don't want to wait for 'would block' type of a response >> from a written socket as in my deployment scenario it would, >> essentially, be too late- I want to begin throttling the data rate >> being directed to the outgoing sctp socket based on the amount of free >> space available in socket's buffer (the exact reasons are not that >> important and will not benefit this discussion). >> >> This is present in TCP protocols with ioctls like SIOCOUTQ. >> >> This is also available in SCTP's implelmentation by OpenSS7 >> (sctp-0.2.26)... >> >> So just to clear a few things: >> 1) is linux's default SCTP implementation in 2.6 different from >> OpenSS7 implementation? > > Yes, very different. > >> 2) if so - are there any plans to support the aforementioned ioctl? > > There are no plans that I know off. This is the first such > question/request, > so feel free to implement it and contribute the code. ok - I will have a go as soon as i get the time (which may not be for a few weeks at least I'm afraid)... from my, albeit currently cursive, understanding I would only need to expose the 'sctp_wspace' from net/sctp/socket.c into the user-space land via an ioctl interface... I will let you know on the progress (whet I get around to it) > -vlad >> >> kind regards >> Leon. >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-sctp" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
