Date: Sat, 17 May 2014 07:49:33 -0700 From: Adrian Chadd <adrian@freebsd.org> To: "Bentkofsky, Michael" <MBentkofsky@verisign.com> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: [rfc] tcp timer update for RSS Message-ID: <CAJ-Vmok-QFMHURShKbZBatw1md55Uc_5rMte3rCVZz9B2Z-X_g@mail.gmail.com> In-Reply-To: <080FBD5B7A09F845842100A6DE79623346F2EB44@BRN1WNEXMBX01.vcorp.ad.vrsn.com> References: <080FBD5B7A09F845842100A6DE79623346F2EB44@BRN1WNEXMBX01.vcorp.ad.vrsn.com>
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On 17 May 2014 07:44, Bentkofsky, Michael <MBentkofsky@verisign.com> wrote: > Hi Adrian, > > > > I haven=E2=80=99t had the chance to look this over carefully yet as we=E2= =80=99re at BSDCan. > I think I understand what you=E2=80=99re trying to achieve by aligning th= e per-CPU > timer processing per core. In principal that sounds reasonable, although = I > am unsure if you were trying to solve a particular performance issue with > this particular change. My sense is this is all preparatory with the goal= of > all inp processing to become per core. Could you comment on the general > evolution you=E2=80=99re considering? Do most of the PCB structures becom= e per-core, > as in PCB groups? > > > > If you=E2=80=99d like us to test this change, I=E2=80=99m happy to do so.= At the moment I > don=E2=80=99t know if we=E2=80=99d expect to see any benefit =E2=80=93 do= you have any traffic > conditions for which this showed any difference? But we can certainly dri= ve > many hundreds of thousands of connections at reasonably high connection > rates if that will help. Hi! Yes, the aim is to provide RSS support in the RSS model of "align everything to a specific core." The goal for RSS is to remove both lock contention between cores and keep data CPU/cache local to improve efficiency there. There's nothing obvious that'll be beneficial right now. The items at https://wiki.freebsd.org/NetworkRSS have to occur before it is beneficial to anyone. -a
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