Re: FreeBSD 5.3b7and poor ata performance

Am Dienstag, 19. Oktober 2004 20:58 schrieb Kenneth Culver:
> Quoting Emanuel Strobl <Emanuel.Strobl_at_gmx.net>:
[...]
> >> How is possible that FreeBSD performs as bad?
> >
> > I have to confirm that I also have even worse transfer rates.
> > It's a ICH2 (i815e) with a not so brand new 80GB WD, but I'd expext about
> > 50MB/s and I get 16MB/s.
> >
> > One interesting thing is that the transferrate is constant with
> > blocksizes from 256 Byte on. Only with a blocksize of 128 Bytes I can see
> > reduced throughput (10MB/s).
> > I can remember, when I last did such "esoteric" tests throughput reached
> > maximum at about 16k blocksize and rapidly degraded with blocksizes
> > smaller than 10k. But now only very very small blocksizes limit the
> > throughput!
> >
> > Some excerpts: (i815 ich2, 5.3-RC1, custom kernel)
> >
> > cale:/usr#22: atacontrol mode 0
> > Master = UDMA100
> > Slave  = BIOSPIO
> >
> > ATA channel 0:
> >     Master:  ad0 <WDC WD800AB-00CBA0/03.06A03> ATA/ATAPI revision 5
> >
> > atapci0: <Intel ICH2 UDMA100 controller> port
> > 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 31.1 on pci0
> > ata0: channel #0 on atapci0
> > ata1: channel #1 on atapci0
> >
> > cale:/usr#25: uname -a
> > FreeBSD cale.flintsbach.schmalzbauer.de 5.3-STABLE FreeBSD 5.3-STABLE #4:
> > Sun Oct 17 02:33:58 CEST 2004
> > root_at_cale.flintsbach.schmalzbauer.de:/usr/obj/usr/src/sys/CALE  i386
>
> your poor performance could be because you have a UDMA100 device on the
> same channel as a BIOSPIO device. I'd try taking the BIOSPIO device off
> that channel
> and see what happens.

The BIOSPIO device is in fact no device :)

ATA channel 0:
    Master:  ad0 <WDC WD800AB-00CBA0/03.06A03> ATA/ATAPI revision 5
    Slave:       no device present
ATA channel 1:
    Master: acd0 <LITE-ON DVD+RW LDW-401S/ES0K> ATA/ATAPI revision 5
    Slave:  acd1 <DV-516E/3.01> ATA/ATAPI revision 5

Thanks,

-Harry

>
> Ken
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