Bug 669300 – Fix shrinking windows with window scaling [rhel-5.6.z]

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Bug 669300 - Fix shrinking windows with window scaling [rhel-5.6.z]

Summary:	Fix shrinking windows with window scaling [rhel-5.6.z]

Status:	CLOSED ERRATA

Aliases:	None

Product:	Red Hat Enterprise Linux 5
Classification:	Red Hat
Component:	kernel (Show other bugs)
Sub Component:
Version:	5.5
Hardware:	All Linux

Priority	urgent Severity high
Target Milestone:	rc
Target Release:	---
Assigned To:	Jiri Pirko
QA Contact:	Red Hat Kernel QE team
Docs Contact:

URL:
Whiteboard:
Keywords:	ZStream

Depends On:	627496
Blocks:
	Show dependency tree / graph

Reported:	2011-01-13 04:01 EST by RHEL Product and Program Management
Modified:	2015-05-04 21:22 EDT (History)
CC List:	12 users (show)

See Also:
Fixed In Version:	kernel-2.6.18-238.3.1.el5
Doc Type:	Bug Fix
Doc Text:	When selecting a new window, the tcp_select_window() function tried not to shrink the offered window by using the maximum of the remaining offered window size and the newly calculated window size. The newly calculated window size was always a multiple of the window scaling factor, however, the remaining window size was not since it depended on rcv_wup/rcv_nxt. As a result, a window was shrunk when it was scaled down. With this update, aligning the remaining window to the window scaling factor assures a window is no longer shrunk.
Story Points:	---
Clone Of:
Environment:
Last Closed:	2011-03-01 15:29:49 EST
Type:	---
Regression:	---
Mount Type:	---
Documentation:	---
CRM:
Verified Versions:
Category:	---
oVirt Team:	---
RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---

Attachments	(Terms of Use)
Add an attachment (proposed patch, testcase, etc.)

External Trackers
Tracker	ID	Priority	Status	Summary	Last Updated
Red Hat Product Errata	RHSA-2011:0303	normal	SHIPPED_LIVE	Moderate: kernel security and bug fix update	2011-03-01 15:29:26 EST

Groups: None (edit)

Description RHEL Product and Program Management 2011-01-13 04:01:17 EST

This bug has been copied from bug #627496 and has been proposed
to be backported to 5.6 z-stream (EUS).

Comment 3 Jiri Pirko 2011-01-26 02:38:10 EST

in kernel-2.6.18-238.3.1.el5

linux-2.6-net-tcp-fix-shrinking-windows-with-window-scaling.patch

Comment 6 errata-xmlrpc 2011-03-01 15:29:49 EST

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2011-0303.html

Comment 7 Martin Prpič 2011-07-13 16:18:54 EDT

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
When selecting a new window, the tcp_select_window() function tried not to shrink the offered window by using the maximum of the remaining offered window size and the newly calculated window size. The newly calculated window size was always a multiple of the window scaling factor, however, the remaining window size was not since it depended on rcv_wup/rcv_nxt. As a result, a window was shrunk when it was scaled down. With this update, aligning the remaining window to the window scaling factor assures a window is no longer shrunk.

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