Date: Thu, 20 Mar 2014 19:12:49 -0300 From: Christopher Forgeron <csforgeron@gmail.com> To: Jack Vogel <jfvogel@gmail.com> Cc: FreeBSD Net <freebsd-net@freebsd.org>, Garrett Wollman <wollman@hergotha.csail.mit.edu> Subject: Re: 9.2 ixgbe tx queue hang Message-ID: <CAB2_NwB4ZO7HYBvvuJ-NDSqo=HvbCz34RUnW_YmGagQs1guaFw@mail.gmail.com> In-Reply-To: <CAFOYbckqw1wT41a-_3FMs6-KNVMV319nODtQ2F09eDRZavFPTg@mail.gmail.com> References: <CAB2_NwDG=gB1WCJ7JKTHpkJCrvPuAhipkn%2BvPyT%2BxXzOBrTGkg@mail.gmail.com> <1159309884.25490921.1395282576806.JavaMail.root@uoguelph.ca> <CAB2_NwAOmPtZjB03pdDiTK2OvQgqk-tYf83Jq4Ukt9jnZA8CNA@mail.gmail.com> <201403202113.s2KLD7GB085085@hergotha.csail.mit.edu> <CAB2_NwCjQ6qtx0SbEERVGs2Y_5pae-g=UbFEwkzmWYGoTuoP%2BQ@mail.gmail.com> <CAFOYbckqw1wT41a-_3FMs6-KNVMV319nODtQ2F09eDRZavFPTg@mail.gmail.com>
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Hi Jack, I'm on ixgbe 2.5.15 I see a few other threads about using MJUMPAGESIZE instead of MJUM9BYTES. If you have a patch you'd like me to test, I'll compile it in and let you know. I was just looking at Garrett's if_em.c patch and thinking about applying it to ixgbe.. As it stands I seem to not be having the problem now that I have disabled TSO on ix0, but I still need more test runs to confirm - Which is also in line (i think) with what you are all saying. On Thu, Mar 20, 2014 at 7:00 PM, Jack Vogel <jfvogel@gmail.com> wrote: > What he's saying is that the driver should not be using 9K mbuf clusters, > I thought > this had been changed but I see the code in HEAD is still using the larger > clusters > when you up the mtu. I will put it on my list to change with the next > update to HEAD. > > > What version of ixgbe are you using? > > Jack > > > > On Thu, Mar 20, 2014 at 2:34 PM, Christopher Forgeron < > csforgeron@gmail.com> wrote: > >> I have found this: >> >> http://lists.freebsd.org/pipermail/freebsd-net/2013-October/036955.html >> >> I think what you're saying is that; >> - a MTU of 9000 doesn't need to equal a 9k mbuf / jumbo cluster >> - modern NIC drivers can gather 9000 bytes of data from various memory >> locations >> - The fact that I'm seeing 9k jumbo clusters is showing me that my driver >> is trying to allocate 9k of contiguous space, and it's failing. >> >> Please correct me if I'm off here, I'd love to understand more. >> >> >> On Thu, Mar 20, 2014 at 6:13 PM, Garrett Wollman < >> wollman@hergotha.csail.mit.edu> wrote: >> >> > In article >> > <CAB2_NwAOmPtZjB03pdDiTK2OvQgqk-tYf83Jq4Ukt9jnZA8CNA@mail.gmail.com>, >> > csforgeron@gmail.com writes: >> > >> > >50/27433/0 requests for jumbo clusters denied (4k/9k/16k) >> > >> > This is going to screw you. You need to make sure that no NIC driver >> > ever allocates 9k jumbo pages -- unless you are using one of those >> > mythical drivers that can't do scatter/gather DMA on receive, which >> > you don't appear to be. >> > >> > These failures occur when the driver is trying to replenish its >> > receive queue, but is unable to allocate three *physically* contiguous >> > pages of RAM to construct the 9k jumbo cluster (of which the remaining >> > 3k is simply wasted). This happens on any moderately active server, >> > once physical memory gets checkerboarded with active single pages, >> > particularly with ZFS where those pages are wired in kernel memory and >> > so can't be evicted. >> > >> > -GAWollman >> > >> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >> > >
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