Date: Fri, 16 Aug 2013 10:59:29 -0700 From: Adrian Chadd <adrian@freebsd.org> To: Luigi Rizzo <rizzo@iet.unipi.it> Cc: Lawrence Stewart <lstewart@freebsd.org>, Lev Serebryakov <lev@freebsd.org>, FreeBSD Net <net@freebsd.org>, Vijay Singh <vijju.singh@gmail.com> Subject: Re: it's the output, not ack coalescing (Re: TSO and FreeBSD vs Linux) Message-ID: <CAJ-VmomRm0NARFQtebs==DTQzgxoSzS9F1Pb%2BNmdL344xu2S2g@mail.gmail.com> In-Reply-To: <CA%2BhQ2%2BhKSnyzu%2Bn8=k%2B2OyTbhGpKCobSNT=J3OiYEbyaRBB%2BBQ@mail.gmail.com> References: <520A6D07.5080106@freebsd.org> <520AFBE8.1090109@freebsd.org> <520B24A0.4000706@freebsd.org> <520B3056.1000804@freebsd.org> <20130814102109.GA63246@onelab2.iet.unipi.it> <587579055.20130814154713@serebryakov.spb.ru> <CAJ-VmokxgWKeuPFGEE-wzLcYpyt3Ua90JZH2BBTj39LoTSUsMg@mail.gmail.com> <BBF40680-9C93-4C86-B7B4-B62ADD1FD41B@gmail.com> <CAJ-VmonWPr2Hm0fk%2B6ykre0MmB1-fxsk7u=9a_z1bTkMjZwYBg@mail.gmail.com> <CA%2BhQ2%2BhKSnyzu%2Bn8=k%2B2OyTbhGpKCobSNT=J3OiYEbyaRBB%2BBQ@mail.gmail.com>
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On 16 August 2013 10:06, Luigi Rizzo <rizzo@iet.unipi.it> wrote: > the usenix paper and talk > > https://www.usenix.org/conference/usenixfederatedconferencesweek/netmap-novel-framework-fast-packet-io > should give a short description of what i did. > > Basically i manually insert returns (and free mbufs and resources) > in some place in the path and then compute the time consumed by > the code as the inverse of the average pps over 0.1 .. 1s intervals. > By moving the point where i place the return, i can estimate the > cost of the various sections of code involved. > > Cool. I think I've seen this stuff. I may have to spin up netmap soon, if only to look at how much more efficient (and how!) you're driving the CPU and IO bus. -adrian
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