Date: Mon, 01 Jun 2009 21:31:08 -0700 From: Julian Elischer <julian@elischer.org> To: Jason Chambers <jchambers@ucla.edu> Cc: freebsd-hackers@freebsd.org Subject: Re: Monitoring throughput of PCIe lanes Message-ID: <4A24AB0C.70506@elischer.org> In-Reply-To: <4A249906.8050802@ucla.edu> References: <4A249906.8050802@ucla.edu>
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Jason Chambers wrote: > Hello all, > > I'm wondering if there is currently a way to monitor the throughput of a > PCIe lane or group of lanes associated with a device ? > > I've done a little exploring of the source and man pages but have yet to > find anything that seems to relate in an obvious form. > > I wonder if netgraph could somehow be used for this ? > > > Thanks, > > --Jason > > _______________________________________________ > freebsd-hackers@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-hackers > To unsubscribe, send any mail to "freebsd-hackers-unsubscribe@freebsd.org" unfortunatly PCIe traffic occurs at a level below that at which the OS can really monitor. there would have to be some hardware support I think. THEORETICALLY you could get every device driver to report back how much traffic it has sent to each device and you could aggregate that by bus bt it would be a lot of work and overhead ad wouldn't really be agood measure of burst throughput...
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