On Apr 03, Clifford King wrote:
> Alessandro Suardi wrote:
>
> > Alessandro Suardi wrote:
> > >
> > > Seems we're not moving from the 8.6 MB/s marker :(
> > >
> > > 2.3.99pre3 idebus=33 36.99 8.60
> > > multcount=0
> > > 2.3.99pre3 idebus=33 36.89 8.56
> > > multcount=8
> > >
>
> > [section removed]
>
> hdparm no longer gives drive performance numbers that are equivalent
> to 2.2.X kernels on the more recent 2.3.X kernels. hdparm uses disk raw
> I/O calls to measure performance and the 2.3.X kernels have had the disk
> code re-worked to improve overall system response while heavy disk
> I/O is occurring. You need to create your own test say by using the "time"
> command and "dd" to read a file of a known size then, calculte the
> transfer rate from the time report.
at least up to ~16 MB/sec for my UDMA33 system, all tests and kernel versions
(2.2.14 and 2.3.51) with hdparm -Tt report the same transfer rates as dd
and other similar tests, including my own benchmark tool which reads
the whole disk and gives transfer rates for every 10+ MB which gives
very informative (and interesting;) plots. and all those values
match those from a much faster PC with K7 and UDMA66.
trouble for my UDMA33 system starts `only' beyond ~16 MB/sec, and again
I get identical results for all tools, including hdparm with 2.3.51 kernel...
Harald
--
All SCSI disks will from now on ___ _____
be required to send an email notice 0--,| /OOOOOOO\
24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\
\ \/OOOOOOOOOOOOOOO\
\ OOOOOOOOOOOOOOOOO|//
Harald Koenig, \/\/\/\/\/\/\/\/\/
Inst.f.Theoret.Astrophysik // / \\ \
koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Fri Apr 07 2000 - 21:00:10 EST