Greetings,
for now I can at least say that this problem does not occur in ubuntu 11.04
(Natty) running "official" kernels.
I think I have now enough evidence about it both for server and deskop 64-bit
kernels in Natty.
My guess is that this would not be an issue also in latest upstream kernel.
An
** Attachment added: "ssh to machine M"
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/985099/+attachment/3092835/+files/ssh_from_P_to_M
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I attach files with outputs from commands ssh -vvv issued on
machine P.
The operation
ssh P /bin/true
(issued again on P) is quick. Almost no noticeable delay.
** Attachment added: "output from ssh to machine N"
https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/985099/+attachment/3
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Title:
ssh long waiting time (delay) on 12.04 (not on 11.04)
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Public bug reported:
We have two subnetworks (with static IP v4 addressing). Call it here
subnetwork S1 and subnetwork S2 .
There is a machine P on S1 . It is the local machine from which I am
reporting this bug. It has a fresh clean installation of xubuntu 12.04
(Precise), 32-bit version.
Next weeks I hopefully will acquire more information about the issue,
likely also by testing newest kernel. However, due to the nature of the
bug, it is possible to test it typically 1 time per day.
** Changed in: linux (Ubuntu)
Status: Incomplete => New
** Changed in: openssh (Ubuntu)
apport information
** Attachment added: "Lspci.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216703/+files/Lspci.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216708/+files/ProcInterrupts.txt
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apport information
** Attachment added: "UdevLog.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216711/+files/UdevLog.txt
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apport information
** Attachment added: "UdevDb.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216710/+files/UdevDb.txt
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apport information
** Attachment added: "ProcModules.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216709/+files/ProcModules.txt
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apport information
** Attachment added: "BootDmesg.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216699/+files/BootDmesg.txt
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apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216707/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216704/+files/Lsusb.txt
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apport information
** Attachment added: "PciMultimedia.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216706/+files/PciMultimedia.txt
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apport information
** Attachment added: "Card0.Amixer.values.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216700/+files/Card0.Amixer.values.txt
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htt
apport information
** Attachment added: "CurrentDmesg.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216702/+files/CurrentDmesg.txt
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apport information
** Attachment added: "Card0.Codecs.codec.0.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216701/+files/Card0.Codecs.codec.0.txt
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h
apport information
** Attachment added: "AplayDevices.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216697/+files/AplayDevices.txt
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apport information
** Attachment added: "ArecordDevices.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216698/+files/ArecordDevices.txt
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apport information
** Attachment added: "AlsaDevices.txt"
https://bugs.edge.launchpad.net/bugs/782092/+attachment/2216696/+files/AlsaDevices.txt
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apport information
** Tags added: apport-collected
** Description changed:
I describe the issue in few steps below.
1.) I want to transfer files from machine A (with ubuntu 11.04, but this
is not important) to machine B (ubuntu 10.10; this is important to say)
using scp.
2.) Mach
I now have acquired enough evidence and confirm all my writings above.
It implies that there may be a scheduling issue in the linux kernel of ubuntu
10.10.
I will try to check if there is similar issue also with Natty.
(I have 15 years of experience in performing CPU intensive tasks on UNIX/Linux
Clint, I can now answer your questions, at least partially.
* If I renice the program, the effect is likely gone. However, I will be
sure only after a longer period of testing.
* Other programs run swiftly (also without renice-ing prog.x).
I will comment on this issue sometime next week or so,
** Attachment added: "what top utility reports"
https://bugs.launchpad.net/bugs/782092/+attachment/2126667/+files/top_report
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T
Public bug reported:
I describe the issue in few steps below.
1.) I want to transfer files from machine A (with ubuntu 11.04, but this
is not important) to machine B (ubuntu 10.10; this is important to say)
using scp.
2.) Machine B is under constant computational load due to a user program
(a si
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