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On Sat, 2008-05-10 at 00:48 +0200, Jesper Krogh wrote: > Rick Jones wrote: > >> The number of contextswitches seems enourmous.. over 120.000 sometimes. > >> When transmitting around the same amount of data (4xgigabit bonded with > >> 802.3ad) 4x110MB/s the amount of contextswitches only reaches 3-4.000. I > >> have no idea if this has any relevance. > >> > >> Should this setup not be able to fill the pipe? > > > > Into which slot was the Neptune inserted? (sure will be nice to have > > Alex Chiang's pci slot id patch in mainline one of these days :) > > > > Is that slot x4, x8, x16? > > I can find out excactly .. on monday. But shouldn't x4 be enough anyway? > wikipedia says 250MB/s pr. lane. And no slots is less than x4, so I > thought that it didn't matter to me. lspci -vvv on the slot can tell you what has been negotiated. Also, you can figure the effective PCIe bandwidth using ~200 MB/s as a rule of thumb, given the various overheads on the bus. So an x4 won't fully load up a 10Gbps link. At least, that's what we're seeing in x8 slots using Infiniband cards, so your mileage may vary. -- Dave Dillow National Center for Computational Science Oak Ridge National Laboratory (865) 241-6602 office -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | |||||||||
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