Red Hat Bugzilla – Bug 53914
(IRQ Routing) SMP-kernel speeds up system clock under network load
Last modified: 2007-04-18 12:37:17 EDT
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Description of problem:
The current SMP-kernel speeds up the system clock when data is transferred
via LAN. This is the case as much for incoming as for ougoing data. Using
the ordinary non-SMP-kernel makes this behaviour disappear. The
acceleration factor is about 4 for up-/downloading entire blocks of data
via FTP, and goes up to about 30 (!) when for instance the command 'ls -R
/' is executed on the remote computer, and the output is displayed on the
local host. This behaviour is independent of X and occurs already in a
simple text console at runlevel 3. Furthermore, it does not depend on the
type of connection (TELNET vs SSH).
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. Boot system into SMP mode
2. Login in to a remote computer via TELNET/SSH
3. Type 'ls -R /'
Actual Results: The system clock runs forward in time like crazy!
Expected Results: System clock keeps running at regular speed
The current system is an INTEL PR440FX based Dual Pentium Pro workstation
with 512 MB of system memory and an integrated INTEL EtherExpress Pro 100B
10/100 MBit/s network adapter.
Could you attach the ouput of "lspci -vv" to this bug ?
Created attachment 32398 [details]
Actual output of the command 'lspci -vv'
Is this still the case with the newer kernels. It should be resolved nowdays
(including with the later errata kernels)