Slowdown Unicast and Multicast after upgrading FOG Server

george1421

@mp12 Read performance is what I would expect from an SSD drive.

The next bit we will test write performance. For this we need to collect the structure of the existing SSD drive. What we need to find is a partition that has at least 1GB of disk space.

Show me the output from this command: lsblk (executed on the target computer in a debug console)

NOTE: The document I’m working from is referenced here: https://forums.fogproject.org/topic/10459/can-you-make-fog-imaging-go-fast

Quazz

@george1421 He did some write tests earlier at around ~100MB/s from RAM to disk using dd.

george1421

@Quazz Interesting, on the previous dd test. I would like to see this dd test and then the next step is an iperf test. That will test local disk and then network without involving the nfs stack or partclone. At least in my mind is how I would break it down. Something had to have changed besides fog.

mp12

@george1421

Server

-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------
Accepted connection from x.x.x.x, port 50672
[  5] local x.x.x.x port 5201 connected to x.x.x.x port 50674
[ ID] Interval           Transfer     Bandwidth
[  5]   0.00-1.00   sec   108 MBytes   903 Mbits/sec
[  5]   1.00-2.00   sec   112 MBytes   942 Mbits/sec
[  5]   2.00-3.00   sec   112 MBytes   942 Mbits/sec
[  5]   3.00-4.00   sec   112 MBytes   942 Mbits/sec
[  5]   4.00-5.00   sec   112 MBytes   942 Mbits/sec
[  5]   5.00-6.00   sec   112 MBytes   942 Mbits/sec
[  5]   6.00-7.00   sec   112 MBytes   942 Mbits/sec
[  5]   7.00-8.00   sec   112 MBytes   942 Mbits/sec
[  5]   8.00-9.00   sec   112 MBytes   942 Mbits/sec
[  5]   9.00-10.00  sec   112 MBytes   942 Mbits/sec
[  5]  10.00-10.04  sec  4.35 MBytes   937 Mbits/sec
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bandwidth       Retr
[  5]   0.00-10.04  sec  1.10 GBytes   939 Mbits/sec   11             sender
[  5]   0.00-10.04  sec  1.10 GBytes   938 Mbits/sec                  receiver
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

Client

Connecting to host x.x.x.x, port 5201
[  5] local x.x.x.x port 50674 connected to x.x.x.x port 5201
[ ID] Interval           Transfer     Bitrate         Retr  Cwnd
[  5]   0.00-1.00   sec   113 MBytes   947 Mbits/sec    3    258 KBytes       
[  5]   1.00-2.00   sec   112 MBytes   943 Mbits/sec    0    364 KBytes       
[  5]   2.00-3.00   sec   112 MBytes   939 Mbits/sec    2    232 KBytes       
[  5]   3.00-4.00   sec   112 MBytes   943 Mbits/sec    1    318 KBytes       
[  5]   4.00-5.00   sec   112 MBytes   943 Mbits/sec    2    211 KBytes       
[  5]   5.00-6.00   sec   112 MBytes   943 Mbits/sec    0    364 KBytes       
[  5]   6.00-7.00   sec   112 MBytes   943 Mbits/sec    1    267 KBytes       
[  5]   7.00-8.00   sec   112 MBytes   943 Mbits/sec    1    364 KBytes       
[  5]   8.00-9.00   sec   112 MBytes   943 Mbits/sec    0    366 KBytes       
[  5]   9.00-10.00  sec   112 MBytes   943 Mbits/sec    1    282 KBytes       
- - - - - - - - - - - - - - - - - - - - - - - - -
[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   943 Mbits/sec   11             sender
[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec                  receiver

iperf Done.

Quazz

@mp12 I found somewhat similiar situations on google where the conclusion was to use Secure Erase on the drive first. Worth a try just to see if it helps?

mp12

@Quazz

Did my best. After trying I noticed that the “frozen state” was active. Removing the SSD power cable while PC was powered on removed the frozen state. Then I was able to do a secure erase. A dd from ramdisk to /dev/sda was at the same speed as before. So no luck at all.

mp12

@Sebastian-Roth @Quazz @george1421

I have some good and bad news.

First the good ones:

I created a deploy using the FOG.Wiki https://wiki.fogproject.org/wiki/index.php/Debug_Mode#Win_7
Therefor I booted a Clonezilla (2.6.4-10-amd64) Flashdrive and mounted the NFS-Share from FOG Server.

I started the deploy with the following command:

cat /images/IMAGEPATH/d1p2.img | zstd -d | sudo partclone.restore -O /dev/sda2 -N -f -i

Tried a deploy with the fog client and still one-third of the expected speed.
I think there is something wrong in the deploy process.
Main difference I can see is that the FOS uses Partclone 0.3.12 and Clonezilla 0.3.13.

Quazz

@mp12 I vaguely recalled someone having this problem before with similar outcomes.

Linking here for further reference: https://forums.fogproject.org/topic/13733/hp-elitebook-830-gen-6-issues-capturing-images-and-deploying-images/10

Our kernels and inits have since received a few upgrades, however.

Are you on the dev-branch, by the way? I don’t believe 1.5.7 was launched with partclone 0.3.12 (that’s for the upcoming release).

If not, then try the init and kernel files from https://dev.fogproject.org/blue/organizations/jenkins/fos/detail/master/122/artifacts

mp12

@Quazz said in Slowdown Unicast and Multicast after upgrading FOG Server:

Are you on the dev-branch

Yes I am on the dev-branch 1.5.7.109 (bzImage Version: 4.19.101)

mp12

@Quazz said in Slowdown Unicast and Multicast after upgrading FOG Server:

I vaguely recalled someone having this problem before with similar outcomes.
Linking here for further reference: https://forums.fogproject.org/topic/13733/hp-elitebook-830-gen-6-issues-capturing-images-and-deploying-images/10

Tried the bzImage529 and checked if RAMDISK size is correct.

Also tried the following Kernels which all end up with a KERNEL PANIC:
4.13.4, 4.11.1, 4.10.1, 4.9.11 and 4.8.11

Other kernels starting with 4.15.2 and above seem to work but not with the sufficient speed.

Sebastian Roth

@mp12 said in Slowdown Unicast and Multicast after upgrading FOG Server:

Therefor I booted a Clonezilla (2.6.4-10-amd64) Flashdrive

From what you wrote so far I would expect the kernel to make the difference. What kernel is in the CloneZilla you used? Boot to a command shell and run uname -a.

mp12

@Sebastian-Roth

Linux debian 5.3.0-1-amd64 #1 SMP Debian 5.3.7-1 (2019-10-19) x86_64 GNU/Linux

Quazz

@Sebastian-Roth I mean, the strange part is that the older versions gave him proper speed too. And it’s not like this is a universal problem since others have not experienced such a large performance difference between FOG versions.

So I guess it’s time for more information to try and pin down the source of it all.

@mp12 Can you list a full spec list of a troubled machine? (or perhaps even two or three different ones if you have that)

It almost assuredly has to be some kind of interaction between certain kind of hardware and the Linux kernel (and its config), so we have to try and narrow it down or at least get a clearer picture of what we’re dealing with.

george1421

@Quazz would the complete fog inventory for this system give us enough data or do we need to dig deeper? If it doesn’t give us all of the data at least it would be a start. What would be grand is of the OP had 2 systems on his campus where one worked correctly and the other is slow. Then we could contrast and compare these two systems.

@Sebastian-Roth Is there a place where we can still download the 1.5.5 or 1.5.6 binaries zip file? I’m wondering if we replace the current bzImage and init.xz with the ones from 1.5.5 or 1.5.6 does that change the performance of these systems. While I highly doubt its the FOG server, this would at least isolate the issue to the FOS Linux install (unless that is our conclusion already).

Sebastian Roth

@george1421 Good point on trying the older binaries. Though I’d expect that you get issues going back to very early binary versions like 1.5.3… They are all available on the fogproject.org website:
https://fogproject.org/binaries1.5.6.zip
https://fogproject.org/binaries1.5.5.zip
and so on all the way to 1.3.0…

george1421

@Sebastian-Roth Yes going back to 1.5.3 version of FOS (at least for the inits) would be a good test of before and after upgrades causing this slowness. All the OP needs to do is download and extract the init.xz file from the zip file and move it to the FOG server to test.

Sebastian Roth

@george1421 @mp12 Using init and kernel binaries from the same archive as you will run into kernel panics quite easily if you do otherwise.

@mp12 I am wondering if you see the same slowness on many different types of hardware or if it’s all machines with the Samsung SSD 860 EVO 500GB??

EDIT: Reading through the whole topic again I stumbled upon this:

[ ID] Interval           Transfer     Bitrate         Retr
[  5]   0.00-10.00  sec  1.10 GBytes   943 Mbits/sec   11             sender
[  5]   0.00-10.00  sec  1.10 GBytes   942 Mbits/sec                  receiver

Eleven retries for a file transfer over a period of 10 seconds seems a lot to me. So we might look at a combination of issues here.

mp12

@Sebastian-Roth @Quazz @george1421
We only have computers with the following specs:

Dell 9010 (BIOS A30)
i7-3770
16GB RAM
Samsung SSD 860 EVO 500GB

Made ten iperf3 tests in a row and got an average of 9.7 retries. Is that really so bad?

We also checked the binaries from 1.5.3 to 1.5.6. with the old image and recieved the following error:
read image_hdr device_size error

Now we are capturing a new image with the 1.5.3 binaries. The above error may have something to do with a mismatching partclone version. Hopefully the deploy speed will be at 12GB/min. If so we will try to capture an image with the current binaries.

Sebastian Roth

@mp12 said in Slowdown Unicast and Multicast after upgrading FOG Server:

Now we are capturing a new image with the 1.5.3 binaries. The above error may have something to do with a mismatching partclone version.

Yeah, definitely. Need to re-capture the image.

Thanks for the information. Good to know you have a fleet of exact same machines and I am sure we will figure out what is causing the slow speed and fix it.

george1421

@Sebastian-Roth The 11 retransmits are something but really not much. If you look at the testing I did on a Dell 790 https://forums.fogproject.org/topic/10459/can-you-make-fog-imaging-go-fast/4 For a single iperf there was no retrans but as soon as I added a second iperf running at the same time the retrans shot up in the hundreds and the throughput dropped off accordingly.

Slowdown Unicast and Multicast after upgrading FOG Server

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