Messages in this thread | | | From | "Benjamin Herrenschmidt" <> | Subject | Re: Performance improvement inquiry | Date | Sun, 13 Oct 2002 01:58:49 +0200 |
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>> First question: Will compiling a kernel with >> the network module resident (as opposed to a loadable >> module) make network performance any better? From >> the reading, it appears that resident modules are only >> faster in initialization, not runtime. I'm new to >> this, so please correct me if I'm wrong. > >Modules are very very fractionally slower than compiled in code due to >TLB misses
Depends on which arch... on ppc32 (ahem... no bad joke pls ;), function calls from modules to kernel or between modules has to go through some "branch islands" as they don't fit within the scope of a "short" branch PPC insn. So you also get a small perf. loss there, but I bet it's barely measurable.
Ben.
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