Messages in this thread | | | Subject | Re: Interesting pentium-memcpy results | Date | Mon, 28 Jul 1997 13:04:55 -0400 | From | Benjamin Saller Bender <> |
| |
Chris Evans <mailto:chris@ferret.lmh.ox.ac.uk> writes: >I just compared 2.1.46 vs. 2.1.46+pentium memcpy patch, and interestingly >enough found that the UNIX byte benchmarks tended to _drop_ a fair bit, >with the exception of process creation and execl throughput. (Note that I >only ran the basic 'system' tests - TCP bandwidth etc. to be determined >when I find the newer benchmarks) >
>It does however show us that there still is performance to be gained. I >presume the process creation test will be using fork() which does a lot of >memcpy'ing of various process credentials in kernel space. > I haven't done the research to verify how well this will work under Linux, but for large a memcpy on the P5 we may wanna consider using the FP unit using double precision read and writes. I have sample code if anyone is interested. -- Benjamin Saller Bender <case@AppliedTheory.com> AppliedTheory Communications Software Engineering Group http://AppliedTheory.com/ Sentio aliquos togatos contra me conspirare.
| |