Bug 1001767 - Negative downloading speed in yum
Negative downloading speed in yum
Product: Fedora
Classification: Fedora
Component: yum (Show other bugs)
Unspecified Unspecified
unspecified Severity low
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Assigned To: packaging-team-maint
Fedora Extras Quality Assurance
Depends On:
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Reported: 2013-08-27 13:17 EDT by Roman
Modified: 2013-09-29 20:42 EDT (History)
6 users (show)

See Also:
Fixed In Version: python-urlgrabber-3.9.1-32.fc19
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Last Closed: 2013-09-29 20:42:29 EDT
Type: Bug
Regression: ---
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RHEL 7.3 requirements from Atomic Host:
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Description Roman 2013-08-27 13:17:15 EDT
Description of problem:

Sometimes yum shows negative downloading speed.

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


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 03:24:28 EDT
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 08:07:07 EDT
python-urlgrabber-3.9.1-32.fc19 has been submitted as an update for Fedora 19.
Comment 3 Fedora Update System 2013-09-27 20:18:05 EDT
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:
then log in and leave karma (feedback).
Comment 4 Fedora Update System 2013-09-29 20:42:29 EDT
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.

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