Red Hat Bugzilla – Bug 163474
excessive polling interrupts on empty or idle IDE CD/DVD drive
Last modified: 2013-03-05 22:43:53 EST
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Description of problem:
When Gnome desktop with hal is running (from a default Workstation install of FC4), then an empty CD or DVD drive on an IDE channel sees interrupts at 9 or 10 per second. After inserting recorded data media (ISO9660) and waiting for the automount to settle, then the drive sees interrupts at about 2 per second. Both of these rates are too high. Most drives take about a full second to open or close the tray, so once per second is plenty often for polling. [Do some drives notify for media changes, which would make polling unnecessary? How can the administrator take advantage?]
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. cat /proc/interrupts | grep ide; sleep 10; cat /proc/interrutps | grep ide
Actual Results: With an empty drive, the corresponding IDE channel sees between 90 and 100 interrupts in 10 seconds (10/second). With a disk mounted, the corresponding IDE channel sees about 20 interrupts in 10 seconds (2/second).
Expected Results: Polling frequency should be 1 Hz or less.
This report targets the FC3 or FC4 products, which have now been EOL'd.
Could you please check that it still applies to a current Fedora release, and
either update the target product or close it ?
The behavior persists in Fedora Core 6, with the entire system "yum update" as
of today, specifically these components which seem relevant:
Namely, an empty IDE CD/DVD drive sees around 9 or 10 interrupts per second, and
a drive with a written disk (iso9660, auto-mounted, otherwise idle) sees about 2
or 3 interrupts per second. I changed the Version of this bugzilla report to fc6.
If hal is not the appropriate component for this issue, then please suggest a
better culprit. Also, is there a setting to control the frequency of polling?
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Please change 'Version' to rawhide; bugzilla won't let me.
The problem persists in rawhide kernel-2.6.25-0.185.rc7.git6.fc9.x86_64. With
two idle IDE CD/DVD drives, I see 21 interrupts per second:
cat /proc/interrupts | grep 15: ; sleep 10; cat /proc/interupts | grep 15:
"ps ax" says that hald-addon-storage is polling each drive "(every 2 sec)".
I checked the box for "I am providing the requested information" when I
submitted Comment #4 above, but the updated page still has Status: NEEDINFO.
This time I'll check the box again, and _also_ tick the radio button for Change
changed over to rawhide.
Let us know if there's anything we can do to help resolve this - this falls into
the category of "we wake up too much".
Changing version to '9' as part of upcoming Fedora 9 GA.
More information and reason for this action is here:
Sure we poll as some drives do not support media detection. I'm not sure what
you want us to do here.
As stated in this original buzilla report, what I want is: "Expected Results:
Polling frequency should be 1 Hz or less."
Additionally, it would be nice for the system administrator to change the
frequency easily, including setting it to zero (no polling.)
(In reply to comment #9)
> As stated in this original buzilla report, what I want is: "Expected Results:
> Polling frequency should be 1 Hz or less."
$ ps aux|grep hald-addon-storage
root 2719 0.0 0.0 24172 1116 ? S May31 0:01
hald-addon-storage: polling /dev/sr0 (every 2 sec)
Of course this translates into more wakeups etc. from the kernel driver.
> Additionally, it would be nice for the system administrator to change the
> frequency easily, including setting it to zero (no polling.)
$ man hal-disable-polling
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