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Date: Wed, 3 Jan 2007 08:44:24 +1300 From: "Keith Chew" <keith.chew@...il.com> To: linux-kernel@...r.kernel.org Subject: Performance bttv versus sharedmem Hi This is just a general question to understand where the improvement can be made. In the first setup, I have these processes: - mencoder recording from bttv chip at 8 fps (cpu 3.5 %) - mplayer playing from bttv chip at 10 fps (cpu 2.1 %) In the second setup, I have these processes: - mencoder recording from bttv to shared mem at 25 fps (cpu 1.7%) - mencoder recording from shared mem at 8 fps (cpu 6.1%) - mplayer playing from shared mem at 10 fps (cpu 3.1 %) For the shared mem setup, the access to the memory is efficient, only a memcopy to a buffer. Are the CPU usages inline with what you'd expect, that the shared mem being almost 2 times the CPU usage? How can I reduce the CPU usage in the shared mem setup? Regards Keith - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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