linux-kernel - 2.6.27 - 2.6.29 upgrade.. RAID 0 CCISS now slower

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Message-Id: <1239645439.14336.1310277599@webmail.messagingengine.com>
Date:	Mon, 13 Apr 2009 10:57:19 -0700
From:	"Mr Blogs" <mrblogs@...-mail.com>
To:	linux-kernel@...r.kernel.org
Subject: 2.6.27 - 2.6.29 upgrade.. RAID 0 CCISS now slower

 I am using Gentoo on a HP DL380 G3. Intel Xeon (P4) 3.06ghz processors,
with a HP COMPAQ CCISS ARRAY in RAID 0 mode (hardware, linux just sees
one single drive)

hdparm on 2.6.27 shows the speed at ~ 130mbs

After performing an upgrade of the kernel

hdparm on 2.6.29 shows the speed at ~ 30mbs (30-50mbs varies)

I looked at the DMESG comparisons,
and the only difference is that 2.6.29 mentions:
"IRQF_DISABLED is not guaranteed on shared IRQs"

Now I have looked for hours to see if it was a configuration issue, but
to no avail.

 Yes the 2.6.27 kernel was self built, and it works fine. The 2.6.29 was
 built using the .config file from the 2.6.27.

I compiled this kernel on two servers, both same spec (well, one has 4GB
ram other has 2GB ram), same setup - and both responded as above.

On the one, I recompiled the kernel to just use the new version (NO
config changes). The other I re-compiled using config changes (removing
things not relevant for the machine etc) - both end up having this
problem.

I have done a "diff" compare on the configs, but there is nothing I can
find that would explain this.

I know that this "IRQF_DISABLED" warning isn't present in 2.6.27 boots,
and that the CISS driver works full speed in that one.

I thought it was originally that I changed the IO Scheduling, but as i
said, on the one machine - all i did was copy the config file and
recompile.

Do you know of anything that could be causing this?

I checked proc/interrupts on both kernel versions, and IRQ 30 is
unshared (IO-APIC-FASTEOI cciss or something like that), i am just
unsure what is causing the issue.

Thankyou.
-- 
  Mr Blogs
  mrblogs@...-mail.com

-- 
http://www.fastmail.fm - The way an email service should be

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