Messages in this thread |  | | | Date | Thu, 29 Jul 2004 13:12:17 +0200 | | From | Jan Oravec <> | | Subject | Re: LSI 53c1030 (Fusion MPT) performance with O_SYNC |
| |
On Thu, Jul 29, 2004 at 12:04:53PM +0200, Arjan van de Ven wrote: > On Thu, 2004-07-29 at 11:56, Jan Oravec wrote: > > > I've noticed poor performance with MySQL/InnoDB when compared to another > > S2880-based box with IDE disks. > > your ide disk probably has write back caching enabled while your > mptfusion doesn't..... if you value data integrity over performance the > mptfusion has a saner default ;)
It was enabled:
# sginfo -c /dev/sda Caching mode page (0x8) ----------------------- Initiator Control 0 ABPF 0 CAP 0 DISC 1 SIZE 0 Write Cache Enabled 1 MF 0 Read Cache Disabled 0 Demand Read Retention Priority 0 Demand Write Retention Priority 0 Disable Pre-fetch Transfer Length 65535 Minimum Pre-fetch 0 Maximum Pre-fetch 0 Maximum Pre-fetch Ceiling 65535 FSW 1 LBCSS 0 DRA 0 Number of Cache Segments 8 Cache Segment size 0 Non-Cache Segment size 0 When I've disabled it on both mptfusion and IDE, it took 40s on mpt and 83s on IDE.
It seems like write-cache is not as effective on mptfusion as it is on IDE?
I am considering plugging there a ZCR with battery, so write-cache has a sense for me.
Jan - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
|  |