>From the dm-crypt performance report, we found it shows low efficiency with crypto engine for some mode (like ecb or xts mode). Because in dm crypt, it will map the IO data buffer with scatterlist, and send the scatterlist of one bio to the encryption engine, if send more scatterlists with bigger size at one time, that helps the engine palys best performance, which means a high encryption speed.
But now the dm-crypt only map one segment (always one sector) of one bio with one scatterlist to the crypto engine at one time. which is more time-consuming and ineffective for the crypto engine. Especially for some modes which don't need different IV for each sector, we can map the whole bio with multiple scatterlists to improve the engine performance. But this optimization is not support some ciphers and IV modes which should do sector by sector and need different IV for each sector. Change since v1: - Introduce one different IV mode. - Change the conditions for bulk mode. Baolin Wang (2): block: Export the __blk_bios_map_sg() to map one bio md: dm-crypt: Introduce the bulk IV mode for bulk crypto block/blk-merge.c | 7 +- drivers/md/dm-crypt.c | 333 +++++++++++++++++++++++++++++++++++++++++++++++- include/linux/blkdev.h | 3 + 3 files changed, 334 insertions(+), 9 deletions(-) -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
