mfi driver performance

Steven Hartland killing at
Mon Sep 10 12:57:19 UTC 2012

How are you intending to use the controller?

If you're looking to put a load of disk in for say ZFS have you tried flashing to a none RAID firmware so it uses mps instead of 

----- Original Message ----- 
From: "Achim Patzner" <ap at>
To: <freebsd-current at>
Sent: Monday, September 10, 2012 1:38 PM
Subject: mfi driver performance


We’re testing a new Intel S2600GL-based server with their recommended RAID adapter ("Intel(R) Integrated RAID Module RMS25CB080”) 
which is identified as

mfi0: <ThunderBolt> port 0x2000-0x20ff mem 0xd0c60000-0xd0c63fff,0xd0c00000-0xd0c3ffff irq 34 at device 0.0 on pci5
mfi0: Using MSI
mfi0: Megaraid SAS driver Ver 4.23
mfi0: MaxCmd = 3f0 MaxSgl = 46 state = b75003f0


mfi0 at pci0:5:0:0:        class=0x010400 card=0x35138086 chip=0x005b1000 rev=0x03 hdr=0x00
    vendor     = 'LSI Logic / Symbios Logic'
    device     = 'MegaRAID SAS 2208 [Thunderbolt]'
    class      = mass storage
    subclass   = RAID

and seems to be doing quite well.

As long as it isn’t used…

When the system is getting a bit more IO load it is getting close to unusable as soon as there are a few writes (independent of 
configuration, it is even sucking  as a glorified S-ATA controller). Equipping it with an older (unsupported) controller like an 
(mfi0 at pci0:10:0:0:       class=0x010400 card=0x100a8086 chip=0x00601000 rev=0x04 hdr=0x00
    vendor     = 'LSI Logic / Symbios Logic'
    device     = 'MegaRAID SAS 1078'
    class      = mass storage
    subclass   = RAID) solves the problem but won’t make Intel’s support happy.

Has anybody similar experiences with the mfi driver? Any good ideas besides running an unsupported configuration?


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