Subject: Re: Massive read/write performance problems with 3.0
To: Manuel Bouyer <bouyer@antioche.eu.org>
From: Tonnerre LOMBARD <tonnerre@bsdprojects.net>
List: port-amd64
Date: 05/09/2006 23:55:43
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Salut,

> > vic# dd if=3D/dev/zero of=3D/dev/rwd0b bs=3D64k count=3D1536
> > 100663296 bytes transferred in 41.410 secs (2430893 bytes/sec)
>=20
> That's way to slow. So it looks like the issue is really somewhere
> between the disk and the controller.
> I would blame the controller, or more probably the way we use it (but wit=
hout
> doc it's hard to fix this :/

Well, I figured that SATA write caching was disabled in the BIOS. I enabled
it but now the thing won't boot up:

Internet Software Consortium DHCP Client V3.0.1rc11                        =
    =20
Copyright 1995-2002 Internet Software Consortium.                          =
    =20
All rights reserved.                                                       =
    =20
For info, please visit http://www.iscbge0: block failed to stop: reg 0x1400=
, bi2
=2Eorg/products/DHCP                                                       =
      =20
                                                                           =
    =20
Listening on BPF/bge0/00:e0:81:5c:a2:18                                    =
    =20
Sending on   BPF/bge0/00:e0:81:5c:a2:18                                    =
    =20
Sending on   Socket/fallback                                               =
    =20
DHCPREQUEST on buvm_fault(0xffff80000ec48420, 0x0, 0, 1) -> e              =
    =20
fatal page fault in supervisor mode                                        =
    =20
trap type 6 code 0 rip ffffffff804207ba cs 8 rflags 10246 cr2  b8 cpl 0 rsp=
 fff0
syncing disks...=20

Not nice!

I don't get thrown to the DDB like I would expect to. Also, the CMOS
checksum is wrong on the next boot every time:

CMOS checksum error - Defaults loaded

Not any nicer.

Any ideas?

				Tonnerre

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