To me, a mysterious "5 second delay" smells like a DNS timeout. I've had this
happen to me due to a buggy/misconfigured DNS server not replying to AAAA queries.
Something like
https://serverfault.com/questions/705629/delay-associated-with-aaaa-request. I don't
remember the details.
I also can't reproduce with curl.
Evan
On 12/4/25 10:30, Petr Pisar wrote:
V Wed, Dec 03, 2025 at 03:36:32PM +0100, Tomas Korbar napsal(a):
Hi everyone,
I just noticed that installation of packages both on my system and in
virtual machines spawned by the TMT tool are very slow. I took a bit of
time to investigate this issue and mirror.slu.cz was picked as the download
source, then I looked at the traffic and the replies to GET requests for
each package were delayed by approximately 5 seconds. Did anyone encounter
similar issues? Should we contact someone about it?
When i used wget to download a package manually the delay did not occur but
dnf communication suffered from the delay reliably always.
I guess they applied some web crawler countermeasure. Or somebody on the
route.
However, I cannot reproduce it locally. wget2 and curl on
"https://mirror.slu.cz/fedora/linux/releases/43/Everything/x86_64/os/Packages/d/dontpanic-1.02-21.fc43.x86_64.rpm";,
neither dnf5 ("dnf5 --repofrompath
_,https://mirror.slu.cz/fedora/linux/releases/43/Everything/x86_64/os --repo
_ download dontpanic").
DNF5 uses librepo which uses curl library. DNF5 does not change much in curl
settings besides a user agent and CA certificates. So I would recommend
reproducing it with "dnf download" command and then with curl command. Also
try different source IP addresses.
-- Petr
--
Evan Goode (he/him)
DNF Technical Lead
Red Hat, Inc. | Atlanta, GA | ET
--
_______________________________________________
devel mailing list -- [email protected]
To unsubscribe send an email to [email protected]
Fedora Code of Conduct:
https://docs.fedoraproject.org/en-US/project/code-of-conduct/
List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines
List Archives:
https://lists.fedoraproject.org/archives/list/[email protected]
Do not reply to spam, report it:
https://pagure.io/fedora-infrastructure/new_issue
