On Fri, Nov 20, 2015 at 4:33 PM, changtao381 <changtao381@xxxxxxx> wrote: > HI All, > > Why it is needed an entry of journal t is aligned by CEPH_PAGE_MASK ? For > it causes the data of journal write are amplified by 2X for small io > linux aio/dio required this > For example write io size 4096 bytes, it may write 8192 bytes > > prepare_single_write 2 will write 98304 : seq 24 len 4324 -> 8192 (head 40 > pre_pad 0 ebl 4324 post_pad 3788 tail 40) (ebl alignment -1) > > Thanks! > > > -- > To unsubscribe from this list: send the line "unsubscribe ceph-devel" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- Best Regards, Wheat -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
