On 07/05/12 16:47, Bernd Schubert wrote: > On 05/07/2012 04:44 PM, Roberto Spadim wrote: >> could check if it have any performace increase? maybe i consider >> upgrading my kernel to get more performace inn raid1 >> > > Depends on your hardware. Hardware that can handle small IO sizes, such > as common hard disks usually don't have problems with 512KB IOs. But if > you should use software on top of hardware raid large IOs might be very > important (again depends on the hw-raid vendor then). > > > Cheers, > Bernd O.K., I've also tested 3.2.16 and there the problem still exists. Bernd pinpointed me to commit b1bd055d397e09f99dcef9b138ed104ff1812fcb (block: Introduce blk_set_stacking_limits function). After cherry-picking it on 3.2.16 it worked. Tomorrow I'll test the performance impact and verify it by block tracing. Cheers, Sebastian -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
