Messages in this thread | | | Date | Fri, 12 Aug 2011 23:29:36 +0530 | Subject | x86 memcpy performance | From | melwyn lobo <> |
| |
Hi All, Our Video recorder application uses memcpy for every frame. About 2KB data every frame on Intel® Atom™ Z5xx processor. With default 2.6.35 kernel we got 19.6 fps. But it seems kernel implemented memcpy is suboptimal, because when we replaced with an optmized one (using ssse3, exact patches are currently being finalized) ew obtained 22fps a gain of 12.2 %. C0 residency also reduced from 75% to 67%. This means power benefits too. My questions: 1. Is kernel memcpy profiled for optimal performance. 2. Does the default kernel configuration for i386 include the best memcpy implementation (AMD 3DNOW, __builtin_memcpy .... etc)
Any suggestions, prior experience on this is welcome.
Thanks, M. -- 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/
| |