Re: 2.2.5 optimizations for web benchmarks?

Greg Lindahl (lindahl@cs.virginia.edu)
Thu, 29 Apr 1999 20:22:04 -0400 (EDT)

> Yes, but the amount of memory you touch is not simply related to the
> number of TLBs. You're probably going to take an exit path out of the
> kernel which returns through 3 or 4 levels of function calls all over
> the kernel.

User programs do occasionally access memory, above and beyond what the
kernel uses...

> In other words, the problem with TLB refill costs is that even a small
> amount of code/data reference is going to touch many TLBs

Fine. Are you then claiming that it's impossible for a program to
touch a lot more than the minimum number of TLB entries, or are you
claiming that you think this is a big effect even for apache due to
the mandatory hits? The first is clearly not true (I write programs
which are extremely TLB-intensive); the second I have no idea about.

-- g

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