Date: Mon, 19 Sep 2011 01:37:33 -0400 From: Arnaud Lacombe <lacombar@gmail.com> To: Jack Vogel <jfvogel@gmail.com> Cc: jfv@freebsd.org, pyunyh@gmail.com, Hooman Fazaeli <fazaeli@sepehrs.com>, Luigi Rizzo <rizzo@iet.unipi.it>, freebsd-hackers@freebsd.org Subject: Re: intel checksum offload Message-ID: <CACqU3MVFmTiPKjRKFcDJ-Th2=R9fRsM1OZV%2BPZE%2BVojQ4_Y65Q@mail.gmail.com> In-Reply-To: <CAFOYbcktOR4SOuktOfQc0WvbQvH-9ViUeAQ4JJax_VbebWnC6w@mail.gmail.com> References: <4E744BCE.7060302@sepehrs.com> <20110917203218.GC13993@michelle.cdnetworks.com> <CACqU3MXffDvH%2B5E3_excGswvsYx0eJ1WxTP16tswy9eK%2BvyH%2Bg@mail.gmail.com> <20110918210647.GA8930@onelab2.iet.unipi.it> <CACqU3MXSms9M-H9jj6zf5qWo05SLNCDBwDv%2B%2BmW5iTNjNLuKkA@mail.gmail.com> <20110919020131.GA11657@onelab2.iet.unipi.it> <CACqU3MV3MHGpV0SR36Ur9cPfGzh4K82dop1mXVRkk51mTCpTrQ@mail.gmail.com> <CAFOYbcktOR4SOuktOfQc0WvbQvH-9ViUeAQ4JJax_VbebWnC6w@mail.gmail.com>
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Hi, On Mon, Sep 19, 2011 at 12:29 AM, Jack Vogel <jfvogel@gmail.com> wrote: > [...] > If you notice, the Linux driver did not enable multiqueue on the hardware > either, so do you think a whole department of software engineers backed > by the hardware engineers who designed the damn thing might have had > a reason? > Let's find out :-) In the mean time, as a hacker, I'd be interested to know why the NVM ships with MSI_X_NUM == 2 at offset 0x1b when the datasheet say it does support up value to 4 ? This might be as simple as "the hardware needs special wiring to support 5 vectors.", or whatever... > IN FACT, as I have a bit more freedom with FreeBSD, I went ahead and > tried it for a while just because I could, implementing the code was not > difficult. Over time however that code proved to be a source of instability > and thus was disabled. > It would be interesting for the records to have this information public, especially the kind of instability seen. > I have heard a rumor that the Linux crew may actually be trying a second > time to make it work, and that might give me cause to look at it again too, > but its not clear if I'll have time with other priorities. > ack. Now, what about header-split support in em(4) ? Thanks, - Arnaud
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