Date: Tue, 11 May 2010 09:51:03 -0400 From: Andrew Gallatin <gallatin@cs.duke.edu> To: Murat Balaban <murat@enderunix.org> Cc: freebsd-net@freebsd.org, freebsd-performance@freebsd.org Subject: Re: Intel 10Gb Message-ID: <20100511135103.GA29403@grapeape2.cs.duke.edu> In-Reply-To: <1273323582.3304.31.camel@efe> References: <AANLkTimMrsM08Rmdr-l6RFu83VkqFw0Pk2sHxpV5Yl5x@mail.gmail.com> <4BE52856.3000601@unsane.co.uk> <1273323582.3304.31.camel@efe>
next in thread | previous in thread | raw e-mail | index | archive | help
Murat Balaban [murat@enderunix.org] wrote: > > Much of the FreeBSD networking stack has been made parallel in order to > cope with high packet rates at 10 Gig/sec operation. > > I've seen good numbers (near 10 Gig) in my tests involving TCP/UDP > send/receive. (latest Intel driver). > > As far as BPF is concerned, above statement does not hold true, > since there is some work that needs to be done here in terms > of BPF locking and parallelism. My tests show that there > is a high lock contention around "bpf interface lock", resulting > in input errors at high packet rates and with many bpf devices. If you're interested in 10GbE packet sniffing at line rate on the cheap, have a look at the Myri10GE "sniffer" interface. This is a special software package that takes a normal mxge(4) NIC, and replaces the driver/firmware with a "myri_snf" driver/firmware which is optimized for packet sniffing. Using this driver/firmware combo, we can receive minimal packets at line rate (14.8Mpps) to userspace. You can even access this using a libpcap interface. The trick is that the fast paths are OS-bypass, and don't suffer from OS overheads, like lock contention. See http://www.myri.com/scs/SNF/doc/index.html for details. Best Regards, Drew
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?20100511135103.GA29403>