Date: Tue, 23 Oct 2012 16:58:18 -0700 From: Jack Vogel <jfvogel@gmail.com> To: Garrett Cooper <yanegomi@gmail.com> Cc: Jack F Vogel <jfv@freebsd.org>, freebsd-net@freebsd.org Subject: Re: ixgb TSO performance degrades by ~30% between 7.4 and 8.2/9.0/9.1 Message-ID: <CAFOYbc=v%2Bc4Vy01bm2OgaLn=Uh3_RC_7KeWUM_UVg6_yzWHwgg@mail.gmail.com> In-Reply-To: <CAGH67wTjVw8O7i9OCvHVJjVjCAXsNHNhs0LobDi4G9iukgf%2BeQ@mail.gmail.com> References: <CAGH67wTjVw8O7i9OCvHVJjVjCAXsNHNhs0LobDi4G9iukgf%2BeQ@mail.gmail.com>
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It you mean the ixgbe driver please call it that, the IS an ixgb driver which is for VERY old PCI cards, from the context I assume you mean the newer hardware :) Jack On Tue, Oct 23, 2012 at 3:57 PM, Garrett Cooper <yanegomi@gmail.com> wrote: > Hi, > > Doing some poking around at the ixgb driver with a card I have at > $work using netperf and two machines hooked up over crossover, I > discovered that while ixgb's throughput performance was fantastic on > 7.3/7.4, thoughput performance of the card is degraded on 8.2/9.0/9.1 > by ~30% (9400Mbps on 7.4 -> 6294Mbps on 9.0 for example). LRO > performance on the other hand is fantastic and doesn't degrade with > the card across FreeBSD versions. Performance remains constant with > ixgb across 8.2/9.0/9.1. I didn't observe the CPU usage. > > More details: > > The machines are hooked up in the following configuration: > > ----------------------- > -------------------- > | Machine 1 | cxgb | <- 10Gbit fibre -> | ix1 | Machine 2 | > ----------------------- > --------------------- > > Machine Configuration: > > The card in Machine 2 is an 82599EB card according to pciconf -lv. > > /boot/loader.conf tunables (most of these are set according to 9.x > defaults in order to establish a sane baseline): > > kern.ipc.nmbjumbo9=262144 > kern.ipc.nmbjumbo16=262144 > kern.ipc.nmbclusters=262144 > kern.ipc.nmbjumbop=262144 > kern.ipc.maxsockbuf=2097152 > > /etc/sysctl.conf tunables: > > net.inet.tcp.recvspace=65536 > net.inet.tcp.recvspace_inc=16384 > net.inet.tcp.recvspace_max=2097152 > net.inet.tcp.sendspace=32768 > net.inet.tcp.sendbuf_max=2097152 > net.inet.tcp.sendbuf_inc=8192 > > Kernel Config: > > Machine 1 is running a custom version of FreeBSD. The version has been > constant over the course of my testing. Can give vague details on the > config, but can't give some specific details. > Machine 2 is running 7.4/8.2/9.0/9.1 with a GENERIC kernel. > > Networking configuration: > > - Machine 1 has an IPv4 address of 10.10.10.1; IPv6 is not configured. > The interface mtu is 1500. > - Machine 2 has an IPv4 address of 10.10.10.2; IPv6 is not configured. > The interface mtu is 1500. > > Netperf configuration: > > - netserver is run on both machines; I don't add any additional > arguments to the netserver invocation so it just goes off and forks. > - netperf is run like: netperf -cCjt TCP_STREAM -H <IP-ADDRESS> > > I was wondering if this was a known issue and/or others had seen > similar problems with this card. I haven't gone into profiling the > kernel yet with DTrace, but if no one gets back to me before sometime > later on this week/next week that will be my next course of action for > tracking down the source of the performance problem. > > Thanks! > -Garrett >
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