* [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv
[not found] <bug-12752-11613@https.bugzilla.kernel.org/>
@ 2011-06-10 4:03 ` bugzilla-daemon
2011-06-10 23:05 ` bugzilla-daemon
` (3 subsequent siblings)
4 siblings, 0 replies; 5+ messages in thread
From: bugzilla-daemon @ 2011-06-10 4:03 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=12752
devsk <kernel-bugs.dev1world@spamgourmet.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Regression|--- |No
--- Comment #1 from devsk <kernel-bugs.dev1world@spamgourmet.com> 2011-06-10 04:03:18 ---
Wow! 2+ years and this bug has not even be looked at by a dev. How is this
driver in the kernel if its not maintained?
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* [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv
[not found] <bug-12752-11613@https.bugzilla.kernel.org/>
2011-06-10 4:03 ` [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv bugzilla-daemon
@ 2011-06-10 23:05 ` bugzilla-daemon
2011-06-12 18:51 ` bugzilla-daemon
` (2 subsequent siblings)
4 siblings, 0 replies; 5+ messages in thread
From: bugzilla-daemon @ 2011-06-10 23:05 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=12752
Adam Radford <aradford@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aradford@gmail.com
--- Comment #2 from Adam Radford <aradford@gmail.com> 2011-06-10 23:05:02 ---
devsk,
I'm sorry about you not getting a response from the previous megaraid_sas
developer. He was probably not watching bugzilla.kernel.org.
There is nothing in the driver that will 'throttle' the I/O on your PERC5
controller.
The software raid code sets various read-ahead values in the block layer
request_queues it sets up:
# grep -i "ra_pages" *
raid0.c: * If an individual device has an ra_pages greater than the
raid0.c: if (mddev->queue->backing_dev_info.ra_pages < 2*
stripe)
raid0.c: mddev->queue->backing_dev_info.ra_pages = 2*
stripe;
raid10.c: if (mddev->queue->backing_dev_info.ra_pages < 2*
stripe)
raid10.c: mddev->queue->backing_dev_info.ra_pages = 2*
stripe;
raid5.c: if (mddev->queue->backing_dev_info.ra_pages < 2 *
stripe)
raid5.c: mddev->queue->backing_dev_info.ra_pages = 2 *
stripe;
raid5.c: if
(conf->mddev->queue->backing_dev_info.ra_pages < 2 * stripe)
raid5.c:
conf->mddev->queue->backing_dev_info.ra_pages = 2 * stripe;
Can you try setting some OS read-ahead values (on top of the controller doing
read-ahead) for the scsi device attached to your PERC5 controller and
re-running
your tests?
i.e.:
/sbin/blockdev --getra /dev/sda (See what you have set currently)
/sbin/blockdev --setra 8192 /dev/sda (Set read ahead for sda to 8192 sectors)
/sbin/blockdev --setra 16834 /dev/sda (Set read ahead for sda to 16384 sectors)
This may cause more I/O to be issued to the card from the OS and may improve
your bonnie++ results.
-Adam
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* [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv
[not found] <bug-12752-11613@https.bugzilla.kernel.org/>
2011-06-10 4:03 ` [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv bugzilla-daemon
2011-06-10 23:05 ` bugzilla-daemon
@ 2011-06-12 18:51 ` bugzilla-daemon
2012-05-30 14:13 ` bugzilla-daemon
2012-05-30 14:13 ` bugzilla-daemon
4 siblings, 0 replies; 5+ messages in thread
From: bugzilla-daemon @ 2011-06-12 18:51 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=12752
--- Comment #3 from devsk <kernel-bugs.dev1world@spamgourmet.com> 2011-06-12 18:51:18 ---
Adam,
Thanks for the response! Yeah, I had played with readahead at that time and it
did make some difference but not much. I sold my Perc card some time ago. I
don't have this issue now. Please close the bug.
Sorry if this was unnecessary digression for you. That was not my intention.
-devsk
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* [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv
[not found] <bug-12752-11613@https.bugzilla.kernel.org/>
` (2 preceding siblings ...)
2011-06-12 18:51 ` bugzilla-daemon
@ 2012-05-30 14:13 ` bugzilla-daemon
2012-05-30 14:13 ` bugzilla-daemon
4 siblings, 0 replies; 5+ messages in thread
From: bugzilla-daemon @ 2012-05-30 14:13 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=12752
Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |alan@lxorguk.ukuu.org.uk
Resolution| |UNREPRODUCIBLE
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* [Bug 12752] megaraid-sas driver performance worse than on-board sata_nv
[not found] <bug-12752-11613@https.bugzilla.kernel.org/>
` (3 preceding siblings ...)
2012-05-30 14:13 ` bugzilla-daemon
@ 2012-05-30 14:13 ` bugzilla-daemon
4 siblings, 0 replies; 5+ messages in thread
From: bugzilla-daemon @ 2012-05-30 14:13 UTC (permalink / raw)
To: linux-scsi
https://bugzilla.kernel.org/show_bug.cgi?id=12752
Alan <alan@lxorguk.ukuu.org.uk> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|RESOLVED |CLOSED
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end of thread, other threads:[~2012-05-30 14:13 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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2011-06-10 23:05 ` bugzilla-daemon
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