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Figure 8. Comparative application performance of Linux-SD relative to Linux-Native. The X-axis crosses
at 80%.
drivers. The experiments use existing benchmarks
and tools to compare the performance of a system
using Nooks to one that does not. Tests ran on a
Dell 3 GHz Pentium 4 PC running Linux 2.4.18.
The machine includes 1 GB of RAM, a Sound-
Blaster Audigy sound card, an Intel Pro/1000
Gigabit Ethernet adapter, and a single 7200 RPM,
80 GB IDE hard disk drive
The same application reliability benchmarks
are used to evaluate system performance with the
exception of the network applications. For the
network driver, throughput is a more useful metric;
therefore, the throughput-oriented
network send
and
network receive
benchmarks are substituted.
In addition, the
web server
benchmark measures
network application performance.
For each benchmark, Nooks isolates a
single
driver. The benchmark executes both on native
Linux without Nooks (
Linux-Native
) and then
again on a version of Linux with Nooks and shadow
Figure 9. Absolute CPU utilization by application.
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