From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Atchley, Scott" Subject: Re: IPoIB performance Date: Wed, 5 Sep 2012 15:48:33 -0400 Message-ID: References: <0000013997217ec3-f6e2593f-2ff8-408d-814e-0345582b31ca-000000@email.amazonses.com> <3F476926-8618-4233-A150-C5D487B55C68@ornl.gov> <0000013997a928ab-36ad5a02-3c82-4daf-8e8a-a86c65e92376-000000@email.amazonses.com> <78D8717C-0505-408B-8625-A9124AB33C9E@ornl.gov> <0000013997d35848-57319f33-839b-4480-a075-53b36f67bfe2-000000@email.amazonses.com> Mime-Version: 1.0 Content-Type: text/plain; charset=Windows-1252 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <0000013997d35848-57319f33-839b-4480-a075-53b36f67bfe2-000000-p/GC64/jrecnJqMo6gzdpkEOCMrvLtNR@public.gmane.org> Content-Language: en-US Sender: linux-rdma-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Christoph Lameter Cc: "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-rdma@vger.kernel.org On Sep 5, 2012, at 3:06 PM, Christoph Lameter wrote: > On Wed, 5 Sep 2012, Atchley, Scott wrote: >=20 >>> AFAICT the network stack is useful up to 1Gbps and >>> after that more and more band-aid comes into play. >>=20 >> Hmm, many 10G Ethernet NICs can reach line rate. I have not yet test= ed any 40G Ethernet NICs, but I hope that they will get close to line r= ate. If not, what is the point? ;-) >=20 > Oh yes they can under restricted circumstances. Large packets, multip= le > cores etc. With the band-aids=85. With Myricom 10G NICs, for example, you just need one core and it can d= o line rate with 1500 byte MTU. Do you count the stateless offloads as = band-aids? Or something else? I have not tested any 40G NICs yet, but I imagine that one core will no= t be enough. Thanks, Scott-- To unsubscribe from this list: send the line "unsubscribe linux-rdma" i= n the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html