Bug 74986 - [patch] sysctlize a parameter of if_em's interrupt moderation
Summary: [patch] sysctlize a parameter of if_em's interrupt moderation
Status: Open
Alias: None
Product: Base System
Classification: Unclassified
Component: kern (show other bugs)
Version: 5.3-RELEASE
Hardware: Any Any
: Normal Affects Only Me
Assignee: Eric Joyner
Keywords: IntelNetworking
Depends on:
Reported: 2004-12-12 14:30 UTC by Shusuke SHINOMIYA
Modified: 2018-05-28 19:45 UTC (History)
1 user (show)

See Also:


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Description Shusuke SHINOMIYA 2004-12-12 14:30:26 UTC
This change sysctlize last one of the parameter of if_em's interrupt
moderation .

sysctl hw.em?.int_throttle_ceil corresponds to the `absolute timer' at
AP450(*1), application note by intel.
*1 ftp://download.intel.com/design/network/applnots/ap450.pdf

`absolute timer' is for suppressing rate of interrupt per unit of time.
The value of int_throttle_ceil means a ceiling of the number of interrupt
fireing per unit of time.

Default value of int_throttle_ceil is 8000. Setting int_throttle_ceil 0
means disabling throttle moderation concerning the absolute timer.


The diff of URL shown below adds sysctl int_throttle_ceil to hw.em?.

Comment 1 Xin LI freebsd_committer 2004-12-12 15:31:30 UTC
Responsible Changed
From-To: freebsd-bugs->tackerman

Over to our Mr. em(4)
Comment 2 Shusuke SHINOMIYA 2004-12-14 02:00:36 UTC
 I'm sorry, there was a mistake in the description of int_throttle_ceil.
 int_throttle_ceil corresponds to the `throttle timer' at chapter 3.4 in

Shunsuke SHINOMIYA <shino@fornext.org>
Comment 3 Mark Linimon freebsd_committer freebsd_triage 2006-04-05 01:38:03 UTC
State Changed
From-To: open->feedback

Did this change ever get incorporated? 

Comment 4 Mark Linimon freebsd_committer freebsd_triage 2006-04-05 01:38:03 UTC
Responsible Changed
From-To: tackerman->linimon

Reset PR assigned to inactive committer. 

Hat:	gnats-admin
Comment 5 Mark Linimon 2006-04-05 15:31:44 UTC
----- Forwarded message from Shunsuke SHINOMIYA <shino@fornext.org> -----

From: Shunsuke SHINOMIYA <shino@fornext.org>
To: Mark Linimon <linimon@FreeBSD.org>

 Thank you for your noticing.
 This patch has not been taken yet.

 And, I modified the patch for RELENG_6.

 This function is useful for suppressing bursty traffic given by
Interrupt Moderation.

 Thanks in advance.

Shunsuke SHINOMIYA <shino@fornext.org>

----- End forwarded message -----
Comment 6 Mark Linimon freebsd_committer freebsd_triage 2006-04-05 20:59:41 UTC
State Changed
From-To: feedback->suspended

The patch has not yet been incorporated.  Mark 'suspended' awaiting an 
interested committer to evaluate. 

Comment 7 Mark Linimon freebsd_committer freebsd_triage 2006-04-05 20:59:41 UTC
Responsible Changed
From-To: linimon->freebsd-bugs
Comment 8 Gleb Smirnoff freebsd_committer 2006-04-07 10:14:32 UTC
Responsible Changed
From-To: freebsd-bugs->glebius

I will look at this.
Comment 9 Gleb Smirnoff freebsd_committer 2007-03-28 15:06:36 UTC
Responsible Changed
From-To: glebius->jfv

Cleaning old PRs assigned to myself... Assign this one to the em(4) maintainer.
Comment 10 Mark Linimon freebsd_committer freebsd_triage 2015-11-12 07:42:17 UTC
Reassign to erj@ for triage.  To submitter: is this issue still relevant?
Comment 11 Eitan Adler freebsd_committer freebsd_triage 2018-05-28 19:45:21 UTC
batch change:

For bugs that match the following
-  Status Is In progress 
- Untouched since 2018-01-01.
- Affects Base System OR Documentation


Reset to open status.

I did a quick pass but if you are getting this email it might be worthwhile to double check to see if this bug ought to be closed.