Hi Pavel, A new Mellanox NIC, ConnectX-4 can achieve line arte with 64b packet for 40G link We will have PMD that supports this NIC in DPDK 2.2 . By the way, this is also an advantage of using verbs API, with almost 0% effort we can support a new NIC
Best Regards, Olga -----Original Message----- From: Pavel Odintsov [mailto:pavel.odint...@gmail.com] Sent: Tuesday, July 07, 2015 10:02 AM To: Olga Shern Cc: Keunhong Lee; Thomas Monjalon; dev at dpdk.org Subject: Re: [dpdk-dev] [PATCH 0/2] Native uio-based PMD for Mellanox ConnectX-3 devices Hello! Sorry for off topic. But this question is very important for me. Olga, could I achieve line rate with Mellanox Cards with 64b packets for 40GE? On Tue, Jul 7, 2015 at 9:50 AM, Olga Shern <olgas at mellanox.com> wrote: > Hi Keunhong, > > I disagree with you regarding the performance of ConnectX-3 PMD driver based > on verbs. We get line rate of 40G link with message size smaller than 512B. > In MLNX_OFED 3.0 we have presented a new verbs, called accelerated verbs, > these verbs improves by more than 100% the performance of RAW QP for DPDK. > The PMD changes based on this new infrastructure have been submitted to this > list and are part of DPDK 2.1 release. > Our approach is to improve performance of userspace verbs then to maintain a > huge amount of code that you have submitted. > > Another advantage to use userspace verbs API is that you have so called > bi-furcated driver by design. Kernel driver can work side by side with DPDK > PMD , if needed, and there is no security issues with this model. > > Best Regards, > Olga > > > ________________________________________________________________ > Olga Shern > Sr. Manager, Acceleration libraries team (Accelio, DPDK, VMA) Mellanox > Technologies, Raanana Israel > > > > -----Original Message----- > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Keunhong Lee > Sent: Monday, July 06, 2015 8:56 PM > To: Thomas Monjalon > Cc: dev at dpdk.org > Subject: Re: [dpdk-dev] [PATCH 0/2] Native uio-based PMD for Mellanox > ConnectX-3 devices > > We found that optimizing fragmentation configuration of mlx4 driver performs > as fast as native PMD. > I think we have to re-consider using native driver rather than ib driver. > > Keunhong. > > 2015-07-07 1:14 GMT+09:00 Thomas Monjalon <thomas.monjalon at 6wind.com>: > >> 2015-07-07 00:57, Keunhong Lee: >> > Answer 1. UIO based driver is faster then ib based driver. >> > It can saturate 40G link with MTU sized packets using a single >> > thread >> while >> > ib wrapper cannot. >> >> OK, interesting. Do you have numbers and details about your >> testbed/scenario? >> >> > Answer 2. Sorry, I missed that. I'll make a new patch email with my >> > real name. >> > >> > Question 1. Is it OK if I separate GPL-based and BSD-based codes >> > into separated patches? >> > mlx4 kernel driver itself is dual licenses, so I think they are >> considered >> > as BSD in my source code. >> > The only source code under GPL is bitmap, integer logarithm, and >> red-black >> > tree contained in mlnx_uio/kernel directory. >> >> These parts will be built in the user-space driver library, right? >> It would change the license, which is not desirable. >> >> Technically, your approach may be interesting. >> But from a maintenance point of view, this huge codebase may be a >> nightmare. >> >> >> > 2015-07-06 23:17 GMT+09:00 Thomas Monjalon <thomas.monjalon at 6wind.com>: >> > >> > > 2015-07-06 22:28, leeopop: >> > > > This is a native UIO-based PMD for Mellanox ConnectX-3 devices. >> > > > It uses a persistent memory library in order to provide a >> > > > persistent scartch area for the mlx4 HCA driver. >> > > >> > > What is the benefit of this UIO approach compared to the OFED >> > > based >> driver? >> > > >> > > > We release the driver itself under BSD license, but to use it >> > > > for commercial products, you may have to re-implement the >> > > > separated GPL sources. >> > > >> > > The GPL sources are not really separated. >> > > The DPDK libraries must be BSD-licensed. >> > > >> > > > The GPL affected source codes reside in the mlnx_uio/kernel >> directory. >> > > >> > > It seems that a large part of the GPL driver was also copied in >> > > mlnx_uio/mlnx/. >> > > >> > > Given that you are dropping a huge GPL codebase (whose you don't >> > > own >> the >> > > copyright) in a BSD library, and that you didn't give your real >> > > name in the signed-off line, it is NACK. >> >> >> >> -- Sincerely yours, Pavel Odintsov
