Date: Wed, 1 Oct 2014 10:56:01 +0200 From: Luigi Rizzo <rizzo@iet.unipi.it> To: Long Tran <kyle.longtran@gmail.com> Cc: "Gurkan, Deniz" <dgurkan@central.uh.edu>, FreeBSD Net <freebsd-net@freebsd.org> Subject: Re: Netmap - Packet generating performance changes Message-ID: <20141001085601.GA5641@onelab2.iet.unipi.it> In-Reply-To: <CACziSJKN=sCvf%2BtxQ2Jk2QxzEG7=3HtOo-LtmBq1AxxPWXr3Ww@mail.gmail.com> References: <CACziSJKN=sCvf%2BtxQ2Jk2QxzEG7=3HtOo-LtmBq1AxxPWXr3Ww@mail.gmail.com>
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On Wed, Oct 01, 2014 at 03:42:06AM -0500, Long Tran wrote: > Hello, > > I am experimenting netmap and see one strange behavior. > When I am generating packets using pkt-gen example from PC1 to PC2, the > rate is about 3Mpps. But when I run pkg-gen -f rx -i p1p1 from PC2, the > generating rate in PC1 goes up to 14.66Mpps. > > I thought the performance of netmap in one PC didn't depend on the other > end. > Could anyone help explain it to me please? flow control on the link is responsible for the slowdown. On FreeBSD, sysctl dev.ix.0.fc=0 disables that On Linux i think it is some ethtool command cheers luigi > > Thanks, > *Long Tran* > Research Assistant > MS in Network Communications and Technology Project Management > University of Houston > _______________________________________________ > 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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