There also seems to have been pretty severe performance regressions in cache bypassed sequential I/O. The newer code barely does 70mb/s sequential writes when sequential_cuttoff is set to 4M however it does around 300mb/s when set to 0 (no bypass) with dd and 1M block size. When using the older codebase the cache bypass is actually slightly faster than going to cache at around 360mb/s but this is still much slower than the underlying block devices (as previously discussed). Joseph. -- CTO | Orion Virtualisation Solutions | www.orionvm.com.au Phone: 1300 56 99 52 | Mobile: 0428 754 846 -- To unsubscribe from this list: send the line "unsubscribe linux-bcache" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
