Date: Mon, 10 Sep 2012 14:38:31 +0200 From: Achim Patzner <ap@bnc.net> To: freebsd-current@freebsd.org Subject: mfi driver performance Message-ID: <6A0C3360-0A1E-4905-A33E-D6CC590D7A5A@bnc.net>
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Hi!
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
or
mfi0@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 SRCSASRB
(mfi0@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?
Achim
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