Bug 1001767

Summary:	Negative downloading speed in yum
Product:	[Fedora] Fedora	Reporter:	Roman <franchukrom>
Component:	yum	Assignee:	Packaging Maintenance Team <packaging-team-maint>
Status:	CLOSED ERRATA	QA Contact:	Fedora Extras Quality Assurance <extras-qa>
Severity:	low	Docs Contact:
Priority:	unspecified
Version:	19	CC:	admiller, ffesti, firas.alkafri, packaging-team-maint, tla, zpavlas
Target Milestone:	---
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	python-urlgrabber-3.9.1-32.fc19	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-09-30 00:42:29 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description Roman 2013-08-27 17:17:15 UTC

Description of problem:

Sometimes yum shows negative downloading speed.

Version-Release number of selected component (if applicable):

3.4.3-104.fc19

How reproducible:

I don't know guaranteed way to reproduce it, but from what I noticed it is more likely to get it on slow/laggy connections. The most of times I observed it were when I used EvDO/CDMA connection (maximal speed - 3.1 Mbits/s, actual speed varies hugely depending on signal strength and weather on Mars). With my fast 25 Mbit/s connection, it is very rare thing but I still saw it a few times.


Steps to Reproduce:
1. Connect to slow Internet (recommended, but can occur with fast one too)
2. yum update (or yum install a-lot-of-huge-things)
3. Wait and watch... Wait and watch...
4. And then it will happen. Or not. Usually it lasts only a few seconds, but sometimes yum drops connection with mirror because of it (more than 60 seconds with speed <1000b/s)

Actual results:

Negative downloading speed.

Expected results:

Actual or at least positive downloading speed.

Additional info:

...

Comment 1 Zdeněk Pavlas 2013-08-28 07:24:28 UTC

I'll look at the rate estimator code if there's some obvious bug. It does simple temporal averaging and if every partial input is >=0 the output should never be negative.  Probably the input to the estimator was garbage (negative size or time deltas).

> but sometimes yum drops connection with mirror because of it (more than 60 seconds with speed <1000b/s)

That's unrelated. The displayed download speed is UI thing *only*.  Yum does not close the connection, curl does (it does no averaging, speed has to be below the limit for the whole period). If you don't want this, set "minrate=100" or so in yum.conf

Comment 2 Fedora Update System 2013-09-27 12:07:07 UTC

python-urlgrabber-3.9.1-32.fc19 has been submitted as an update for Fedora 19.
https://admin.fedoraproject.org/updates/python-urlgrabber-3.9.1-32.fc19

Comment 3 Fedora Update System 2013-09-28 00:18:05 UTC

Package python-urlgrabber-3.9.1-32.fc19:
* should fix your issue,
* was pushed to the Fedora 19 testing repository,
* should be available at your local mirror within two days.
Update it with:
# su -c 'yum update --enablerepo=updates-testing python-urlgrabber-3.9.1-32.fc19'
as soon as you are able to.
Please go to the following url:
https://admin.fedoraproject.org/updates/FEDORA-2013-17817/python-urlgrabber-3.9.1-32.fc19
then log in and leave karma (feedback).

Comment 4 Fedora Update System 2013-09-30 00:42:29 UTC

python-urlgrabber-3.9.1-32.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.