Created attachment 852294 [details]
new media backend - slow download - 20210901

Follow up from mailing list discussion:
https://lists.opensuse.org/archives/list/factory@lists.opensuse.org/message/6A3ZAFCBEPZTQ4KO2DLD5TAPT5ZNZU2V/

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"regular" dup = zypper dup
"super" dup = env ZYPP_SINGLE_RPMTRANS=1 ZYPP_MEDIANETWORK=1 zypper dup

test:
notebook: super dup to get snapshot 20210831.
desktop: regular dup to get snapshot 20210831.

The download with super dup was four times slower than the regular dup.
The snapshot was fresh so the "additional mirror rating" from the new media
backend must have made a poor choice due to the ongoing mirror syncing.

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"...might be interesting to see your zypper log for the slow case to check if
any timeouts were firing."

Couldn't find timeouts on the log from the slow case (notebook).
I tried to compare the mirrors used on both cases but the logs are different:
while the old media backend logged the mirrors used the new media backend
didn���t.

libzypp-17.28.1-1.1