Rb-tree construction, insertion, which needs memory allocation, mutex lock, unlock is more CPU expensive then streamlined crc calculation of sometimes 100 bytes or less. On 11/11/15, 12:03 AM, "池信泽" <xmdxcxz@xxxxxxxxx> wrote: >Ah, I confuse that why the crc cache logic would exhaust so much cpu. > >2015-11-11 15:27 GMT+08:00 Evgeniy Firsov <Evgeniy.Firsov@xxxxxxxxxxx>: >> Hello, Guys! >> >> While running CPU bound 4k block workload, I found that disabling crc >> cache in the buffer::raw gives around 7% performance improvement. >> >> If there is no strong use case which benefit from that cache, we would >> remove it entirely, otherwise conditionally enable it based on the >>object >> size. >> >> ‹ >> Evgeniy >> >> -- >> 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 > > > >-- >Regards, >xinze ��.n��������+%������w��{.n����z��u���ܨ}���Ơz�j:+v�����w����ޙ��&�)ߡ�a����z�ޗ���ݢj��w�f
