mfi driver performance

Hi!

We=92re testing a new Intel S2600GL-based server with their recommended =
RAID adapter ("Intel(R) Integrated RAID Module RMS25CB080=94) 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=20
mfi0: MaxCmd =3D 3f0 MaxSgl =3D 46 state =3D b75003f0=20

or

mfi0@pci0:5:0:0:        class=3D0x010400 card=3D0x35138086 =
chip=3D0x005b1000 rev=3D0x03 hdr=3D0x00
    vendor     =3D 'LSI Logic / Symbios Logic'
    device     =3D 'MegaRAID SAS 2208 [Thunderbolt]'
    class      =3D mass storage
    subclass   =3D RAID

and seems to be doing quite well.

As long as it isn=92t used=85

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 SRCSASRB
(mfi0@pci0:10:0:0:       class=3D0x010400 card=3D0x100a8086 =
chip=3D0x00601000 rev=3D0x04 hdr=3D0x00
    vendor     =3D 'LSI Logic / Symbios Logic'
    device     =3D 'MegaRAID SAS 1078'
    class      =3D mass storage
    subclass   =3D RAID) solves the problem but won=92t make Intel=92s =
support happy.

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

Achim

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