BBRv2 v2alpha branch rebased from 5.4 to 5.10, supports all CCs and E2 GCE VMs
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Neal Cardwell
Jan 14, 2021, 6:04:09 PM1/14/21
to BBR Development
Hi all,
By popular demand, we have rebased the BBRv2 v2alpha branch from 5.4 to 5.10.
The BBRv2 code in this release should be functionally identical to the previous release, since in this rebase we only made the minimal changes to the BBRv2 and TCP patches necessary to get the code to compile.
There were two changes of note we incorporated during the rebase. The kernel .config generated by the gce-install.sh build/install/boot script now has some added features:
(1) it builds all available congestion control modules, to facilitate comparisons (a request made recently on the bbr-dev list here)
(2) it has UEFI support needed to allow booting on the new E2 "cost-optimized general purpose" VM type on Google Cloud
You can find the list of rebased commits here.
As always, previous versions of the v2alpha release can be found using the git tags in the Google bbr repository.
By popular demand, we have rebased the BBRv2 v2alpha branch from 5.4 to 5.10.
The BBRv2 code in this release should be functionally identical to the previous release, since in this rebase we only made the minimal changes to the BBRv2 and TCP patches necessary to get the code to compile.
There were two changes of note we incorporated during the rebase. The kernel .config generated by the gce-install.sh build/install/boot script now has some added features:
(1) it builds all available congestion control modules, to facilitate comparisons (a request made recently on the bbr-dev list here)
(2) it has UEFI support needed to allow booting on the new E2 "cost-optimized general purpose" VM type on Google Cloud
You can find the list of rebased commits here.
As always, previous versions of the v2alpha release can be found using the git tags in the Google bbr repository.
best,
neal
neal
Matt Mathis
Jan 15, 2021, 4:51:40 PM1/15/21
to Neal Cardwell, BBR Development
Great! I'm sure this will provoke more testing!
The best way to predict the future is to create it. - Alan Kay
We must not tolerate intolerance;
Thanks,
--MM--The best way to predict the future is to create it. - Alan Kay
We must not tolerate intolerance;
however our response must be carefully measured:
too strong would be hypocritical and risks spiraling out of control;
too weak risks being mistaken for tacit approval.
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Neal Cardwell
Jan 15, 2021, 6:29:53 PM1/15/21
to BBR Development
Based on some quick feedback from the user community (thanks!) we have fixed a few minor issues with yesterday's release, and pushed an update to the v2alpha branch in the github repo. The fixes can be found at the latest tagged release:
The changes since yesterday's release:
(1) a bug fix for the warning that has been reported by a few users:
WARN_ON_ONCE(bbr->prior_cwnd == 0);
(2) a fix for a compilation error caused for users of the following
.config option:
CONFIG_BPF_SYSCALL=y
(3) enabled the .config option CONFIG_BPF_SYSCALL=y to catch further issues
of this kind
WARN_ON_ONCE(bbr->prior_cwnd == 0);
(2) a fix for a compilation error caused for users of the following
.config option:
CONFIG_BPF_SYSCALL=y
(3) enabled the .config option CONFIG_BPF_SYSCALL=y to catch further issues
of this kind
best,
neal
ps: as always, you can find the instructions to download and build Linux TCP BBRv2 alpha here:
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