WebPerf Google's BBR Algorithm for Speeding up Internet Traffic Gains Wider Adoption

Yes , you are correct the problem is not exactly with database but with tasks that require external source
Like adding new content info from external API , and also yum update didn't work

So i tried pinging those source and i was able too which is weird

I thought the problem is with the website, so i tried a different copy, i was able to retrieve content from API after many attempts but unable to submit it to database

There was a new version of kernel 4.12-8, which i tried 20 mins ago, but the server stuck on boot as described by Host provider kernel panic

"This is a notification that you server is currently experiencing a Kernel Panic due to an remotely mounted FileSystem not being able to mount for an unkown reason. If you require it, we can have a KVM made available right away to you for $50/day. Otherwise, we can schedule a KVM free of charge for the first 24 hours tomorrow. Please let us know how you would like to proceed."

Picture sent by provider
http://imgur.com/a/d1Ao2

 

Great to see that your server provider offers free KVM switch support to fix your kernel panic.
Let this be a clear message to all of you, who are considering to use the elrepo kernel.

I have seen and experienced it before kernel panics et al.
Do not use the elrepo kernel in a production environment.

 

Yes they are one of the best provider i have being with them for more than 5 years now
Very flexible and fast support, after i explained to them what i did they went ahead and fixed it and updated me on every step.

I will bookmark this tutorial and try again another time.

Regards.

 

@Tinkerd10 Could you share your provider with us ?

 

@ArisC Sorry for late reply
My hosting provider is Managed Services | Colocation Canada | Cloud Service - eStruxture Data Centers formerly known as (netelligent)
- One of the best support
- Very flexible When it come to hardware changes or software for that matter

 

Code:

# yum install centos-release-xen
Loaded plugins: fastestmirror, priorities, versionlock
Loading mirror speeds from cached hostfile
 * base: mirror.0x.sg
 * epel: ams.edge.kernel.org
 * extras: mirror.0x.sg
 * rpmforge: kartolo.sby.datautama.net.id
 * updates: mirror.0x.sg
284 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package centos-release-xen.x86_64 10:8-3.el7 will be installed
--> Processing Dependency: /usr/bin/grub-bootxen.sh for package: 10:centos-release-xen-8-3.el7.x86_64
--> Processing Dependency: /etc/pki/rpm-gpg/RPM-GPG-KEY-CentOS-SIG-Virtualization for package: 10:centos-release-xen-8-3.el7.x86_64
--> Running transaction check
---> Package centos-release-virt-common.noarch 0:1-1.el7.centos will be installed
---> Package centos-release-xen-common.x86_64 10:8-3.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================
 Package                                                   Arch                                  Version                                         Repository                             Size
=============================================================================================================================================================================================
Installing:
 centos-release-xen                                        x86_64                                10:8-3.el7                                      extras                                6.3 k
Installing for dependencies:
 centos-release-virt-common                                noarch                                1-1.el7.centos                                  extras                                4.5 k
 centos-release-xen-common                                 x86_64                                10:8-3.el7                                      extras                                6.9 k

Transaction Summary
=============================================================================================================================================================================================
Install  1 Package (+2 Dependent packages)

Total download size: 18 k
Installed size: 4.6 k
Is this ok [y/d/N]: y
Downloading packages:
(1/3): centos-release-virt-common-1-1.el7.centos.noarch.rpm                                                                                                           | 4.5 kB  00:00:00     
(2/3): centos-release-xen-8-3.el7.x86_64.rpm                                                                                                                          | 6.3 kB  00:00:00     
(3/3): centos-release-xen-common-8-3.el7.x86_64.rpm                                                                                                                   | 6.9 kB  00:00:00     
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                        121 kB/s |  18 kB  00:00:00     
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : centos-release-virt-common-1-1.el7.centos.noarch                                                                                                                          1/3
  Installing : 10:centos-release-xen-common-8-3.el7.x86_64                                                                                                                               2/3
  Installing : 10:centos-release-xen-8-3.el7.x86_64                                                                                                                                      3/3
  Verifying  : 10:centos-release-xen-8-3.el7.x86_64                                                                                                                                      1/3
  Verifying  : 10:centos-release-xen-common-8-3.el7.x86_64                                                                                                                               2/3
  Verifying  : centos-release-virt-common-1-1.el7.centos.noarch                                                                                                                          3/3

Installed:
  centos-release-xen.x86_64 10:8-3.el7                                                                                                                                                       

Dependency Installed:
  centos-release-virt-common.noarch 0:1-1.el7.centos                                               centos-release-xen-common.x86_64 10:8-3.el7                                             

Complete!
[root@centos-c-2-4gib-sgp1-01 html]# yum update
Loaded plugins: fastestmirror, priorities, versionlock
Loading mirror speeds from cached hostfile
 * base: centos.netonboard.com
 * epel: ams.edge.kernel.org
 * extras: centos.netonboard.com
 * rpmforge: kartolo.sby.datautama.net.id
 * updates: centos.netonboard.com
centos-virt-xen-46                                                                                                                                                    | 2.9 kB  00:00:00     
centos-virt-xen-46/7/x86_64/primary_db                                                                                                                                | 4.5 MB  00:00:02     
477 packages excluded due to repository priority protections
No packages marked for update
[root@centos-c-2-4gib-sgp1-01 html]# sysctl net.ipv4.tcp_available_congestion_control
net.ipv4.tcp_available_congestion_control = cubic reno
[root@centos-c-2-4gib-sgp1-01 html]#

yum update has nothing new to install though.

 

If everything is configured correctly, the system should take the Xen kernel.
A common problem is that you have a newer kernel already installed (+4.9).
Then of course it will not be updated to the Xen kernel, which is in fact 4.9.*.

Otherwise try yum update kernel.

Or use the compatible Oracle UEK5 kernel (4.14 LTS with TCP-BBR enabled) as the Xen project is more or less a dead end.

Releasing a patch is great. But there are a few problems.

1. Last Cloudflare code release is from Jun 28, 2017. So first see and then believe.

2. The upstream Nginx team has not accepted patches from third parties for ages (just review there forum).

In fact, patches are no longer offered by Cloudflare and Google because they are not accepted for bla bla and blah blah reason.

3. As intended the Cloudflare patch needs a modern kernel with BBR for compatibility requirements. And thus, compatibility issues can occur with a lot of servers. It seems to me very likely that it will not be implemented.

This is now typically a patch that works perfectly with a specific system such as Cloudflare but does not work with the mainstream.

 

someone tried bbr with net.ipv4.tcp_notsent_lowat = 16384

are there any tests?

 

Is the above Cloudflare patch already available?