> Elevator for flash devices should automatically be null and most of
the
> SCSI layer isn't actually used so it would be interesting to know for
> example what shows up in comparative profiles so that it can be
optimised
> or dropped out.
Here is the performance number from some experiments.
Test System :
Dell Power Edge R710 (1 x Quad core processor @3.20GHz)
OS:
RHEL (Enterprise) ver5.5 x64 (2.6.18-194.el5)
Test Software:
Vdbench ver 5.02
These experiments were done by changing the queue depth in
vdbench(Q=xxx).
|------------------------------------|
| ahci | ahci | mtipx2xx| mtipx2xx|
| Q=256 | Q=32 | Q=32 | Q=256 |
|------------------------------------------------------------|
|4k random read (IOPS) | 15,831 |15,763 | 244,795 | 783,778 |
|4k random write (IOPS) | 4,058 | 4,072 | 46,696 | 135,864 |
|128k seq. read (MBps) | 2,284 | 2,258 | 3,295 | 3,060 |
|128k seq. write (MBps) | 1,049 | 1,053 | 2,092 | 2,078 |
|------------------------------------------------------------|
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