----- Original Message -----
From: "Dmitry Morozovsky" <ma...@rinet.ru>
To: "Steven Hartland" <kill...@multiplay.co.uk>
Cc: <m...@freebsd.org>; <freebsd-stable@freebsd.org>
Sent: Sunday, March 18, 2012 8:45 PM
Subject: Re: ahci hangs on Supermicro MicroCloud second channel
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)
I'm seeing the following here:-
* ada0: <WDC WD1003FBYX-01Y7B0 01.01V01> ATA-8 SATA 2.x device: gives 109MB/s
* ada1: <Corsair Force 3 SSD 1.3> ATA-8 SATA 3.x device: gives 114MB/s
So both pretty reasonable although not fantastic.
What value do you have for sysctl vfs.read_max?
default for both cases, 8
Try 32 that's what we have here set here.
Not sure its been released yet but we where running a pre-release BIOS which
added the ability to disabled C1E, which caused us CPU performance issue in
are particular environment.
Regards
Steve
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