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Date: Mon, 19 Mar 2012 00:45:02 +0400 (MSK)
From: Dmitry Morozovsky <marck@rinet.ru>
To: Steven Hartland <killing@multiplay.co.uk>
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Cc: mav@freebsd.org, freebsd-stable@freebsd.org
Subject: Re: ahci hangs on Supermicro MicroCloud second channel
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On Sun, 18 Mar 2012, Steven Hartland wrote:

> > different on ada0 and ada1!):
> > ada0, MC 50-60 MBps ada1, MC 13-25 MBps
> > ada*, 5017 130+ MBps
> > 
> > Could you please post SATA/AHCI BIOS settings from your machines? Thanks a
> > lot!
> 
> Just AHCI configured as far as I remember.

Microcloud has AFAIR additional settings for delaying disk spin and 
enablink/disabling hotswap, but mangling these options does not change anything 
for me

> What you mean by MC vs 5017?

platform name: MicroCloud vs 5017C-MTF, both based on the same chipset

> How are you measuring disk speed?

the simplest: dd if=/dev/ada0 of=/dev/null bs=1m count=16k (linear read 
16g at the beginning of disk)

> What value do you have for sysctl vfs.read_max?

default for both cases, 8

-- 
Sincerely,
D.Marck                                     [DM5020, MCK-RIPE, DM3-RIPN]
[ FreeBSD committer:                                 marck@FreeBSD.org ]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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