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Date:      Sun, 18 Mar 2012 21:48:15 -0000
From:      "Steven Hartland" <killing@multiplay.co.uk>
To:        "Dmitry Morozovsky" <marck@rinet.ru>
Cc:        mav@freebsd.org, freebsd-stable@freebsd.org
Subject:   Re: ahci hangs on Supermicro MicroCloud second channel
Message-ID:  <D3D5F844119143D8AB71B94265B674BE@multiplay.co.uk>
References:  <alpine.BSF.2.00.1203181934540.65171@woozle.rinet.ru><DF1AA664FAF24CE3BE38746A6F852BE4@multiplay.co.uk><alpine.BSF.2.00.1203182057380.65171@woozle.rinet.ru><4EB522A5E2744235B0680BAF97F81862@multiplay.co.uk> <alpine.BSF.2.00.1203190039230.74471@woozle.rinet.ru>

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----- Original Message ----- 
From: "Dmitry Morozovsky" <marck@rinet.ru>
To: "Steven Hartland" <killing@multiplay.co.uk>
Cc: <mav@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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