"The current Linux symmetric multiprocessing (SMP) kernel at
both the 2.4 and 2.5 versions was made aware of Hyper-Threading,
and performance speed-up had been observed in multithreaded
"This article gives the results of our investigation into the
effects of Hyper-Threading (HT) on the Linux SMP kernel. It
compares the performance of a Linux SMP kernel that was aware of
Hyper-Threading to one that was not. The system under test was a
multithreading-enabled, single-CPU Xeon. The benchmarks used in the
study covered areas within the kernel that could be affected by
Hyper-Threading, such as the scheduler, low-level kernel
primitives, the file server, the network, and threaded support.
"The results on Linux kernel 2.4.19 show Hyper-Threading
technology could improve multithreaded applications by 30%. Current
work on Linux kernel 2.5.32 may provide performance speed-up as
much as 51%..."
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