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Figure 4. SPECjbb2005 Performance
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3.2. Kernel Compile
This experiment shows the time taken to do kernel compile, which is both CPU and MMU intensive workload due to forking of many
parallel processes. As with the previous experiment, CPU is 100 percent utilized and thus FT performance is dependent on how well
the secondary can keep pace with the primary. This workload does some disk reads and writes, but generates no network traffic.
Besides timer interrupt events, the FT logging traffic includes the disk reads. As seen in theFigure 5, the performance overhead of
enabling FT was very small.
Figure 5. Kernel Compilation Performance
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8
SPECjbb2005
RHEL 5 64-bit, 4GB
Kernel Compile
(lower is better)
SLES 10 32-bit, 512MB
FT tra c:
1.4 Mbits/sec
FT Disabled
FT Enabled
FT tra c:
3 Mbits/sec
FT Disabled
FT Enabled
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