thanks for bringing me the bad news :) what i described is actually half of the problem. a small history lesson: i had a sending application that send to multiple destinations udp packets. due to timing accuracy request I've added packet timing sending based on /dev/rtc. now what happens is that I'm sending small packets (1.5k) very frequently to each destination and i have many destinations with different content to send. The long term solution is moving to kernel space almost completely. for now i need a solution to do one of the following: - batch sendto that performs sendto to different destinations different contents. - sendto that receives big data chunk and cut it to pieces and send it with the accuracy i need. - somehow using sendfile and somehow have accuracy in sending. what do you say? On Mon, 2004-12-20 at 14:50 -0500, Neil Horman wrote: > Nir Dremer wrote: > > > > Due to the fact that the sending content is not static i can't use sendfile. > > > > Is there a way to merge differenent sendto with different targets to one > > system call? > > > Different targets, as in different ip destinations for each datagram? > That puts you out of luck in my mind I'm afraid. > > > if there's no ready-made solution, I would be glad for design > > suggestions of such a wrapper kernel module. > > > if you can pick off data bound for the same destination, you can > coalesce them in userspace from within your app, and only call sendto > after a certain data threshold is reached. That would reduce your > sendto overhead somewhat. Other than that, I think you're out of luck. > Neil > > > thanks > > > > On Mon, 2004-12-20 at 13:07 -0500, Neil Horman wrote: > > > >>Nir Dremer wrote: > >>> I'm looking for a way to perform several SendTo command from user-space > >>> in one system call.. is there any way to do so? > >>> > >>> The purpose is to avoid the system call overhead due to the massive use > >>> of SendTo in my code. > >>> > >>> any help will be appreciated... > >>> > >>> > >>> (copy of the message sent to c-programming mailing list) > >>> > >>> > >>> Cheers, > >>> Nir Dremer > >>> ---------------------------------------------------------------------------------------- > >>> "Real leaders are ordinary people with extraordinary determinations." > >>> -- John Seaman Garns > >>> > >>> - > >>> : send the line "unsubscribe linux-net" in > >>> the body of a message to majordomo@xxxxxxxxxxxxxxx <mailto:majordomo@xxxxxxxxxxxxxxx> > >>> More majordomo info at http://vger.kernel.org/majordomo-info.html > >>Dependent on your needs and flexibility in writing your application, the > >> sendfile() call might help you out some. > >> > >>Neil > >> > > - : send the line "unsubscribe linux-net" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
