Date: Tue, 4 Mar 2014 15:16:31 +0400 From: Slawa Olhovchenkov <slw@zxy.spb.ru> To: Adrian Chadd <adrian.chadd@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org>, "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org> Subject: Re: UDP transmit and no flowid Message-ID: <20140304111630.GA84822@zxy.spb.ru> In-Reply-To: <CAJ-VmomNsR5n8K7k%2BqcTAaAn0HiUcxmFVDxJUw8AD5ZyKHTn5w@mail.gmail.com> References: <CAJ-VmomNsR5n8K7k%2BqcTAaAn0HiUcxmFVDxJUw8AD5ZyKHTn5w@mail.gmail.com>
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On Mon, Mar 03, 2014 at 05:17:08PM -0800, Adrian Chadd wrote: > So something I was told about whilst investigating RSS at Netflix was > that the UDP path doesn't actually get set by anything unless you're > using flowtable. So, if one doesn't define flowtable, the transmit > path congests quite heavily through one TX queue. Now you touch UDP? Can you add "back pressure" for UDP sockets? (currenly UDP socket don't signaled about output buffer full and just drop packets, regardless)
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