Date: Sat, 02 Dec 2017 07:20:56 -0500 From: Joe Buehler <aspam@cox.net> To: "K. Macy" <kmacy@freebsd.org> Cc: "freebsd-net@freebsd.org" <freebsd-net@freebsd.org> Subject: Re: netmap / LINUX realtime / ixgbevf: huge RX latencies Message-ID: <5A229AA8.3070002@cox.net> In-Reply-To: <gtBX1w00Q14YBDM01tBXX6> References: <5A206FB9.3010106@cox.net> <gtBX1w00Q14YBDM01tBXX6>
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K. Macy wrote: > HEAD or 11? I'm not quite sure what the question means but there is this in the netmap code: ./net/netmap.h:42:#define NETMAP_API 11 /* current API version */ LINUX kernels nowadays can timestamp frames when they arrive from the NIC. I made a trivial patch to the netmap driver to turn this on and also pass the timestamp to user space, and will pass on the changes. I am doing frame latency measurements and this simple change eliminated a *whole* lot of noise in the measurements. Joe Buehler
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