[rescue] playing with the new E250 ... disk performance vs. old PeeCee

[Magnus]

Magnus wrote:

> Do the low direct disk read numbers for the Sun box surprise anyone?  Am 
> I hitting a limitation of the SCSI controller here?  I'm not too 
> familiar with the E250 platform yet and I was thinking maybe it had a 
> faster SCSI controller than that.  Looks more like it maxes out at 20MB/sec.


OK more info... Ubuntu 6.06LTS "dapper" on an E250 is a wee bit broken.

I'm running spot's distro, Aurora 2.0 now.  Much more better!

target0:0:0: FAST-20 WIDE SCSI 40.0 MB/s ST (50 ns, offset 16)
-vs-
target0:0:0: FAST-20 SCSI 20.0 MB/s ST (50 ns, offset 16)

Old performance:
  Timing O_DIRECT cached reads: 920 MB in 2.00 seconds = 459.97 MB/sec
  Timing O_DIRECT disk reads: 50 MB in 3.00 seconds = 16.64 MB/sec

New performance:
  Timing O_DIRECT cached reads:   896 MB in  2.00 seconds = 448.87 MB/sec
  Timing O_DIRECT disk reads:   88 MB in  3.03 seconds =  29.02 MB/sec