djn@cs.liv.ac.uk (David Nixon) (06/20/91)
According to the manual Software Lookaside Buffers may help the
performance of Precision Architecture Machines with small
Hardware TLBs. Perhaps someone from HP would give an assessment
of the adequacy of the TLB on the HP-635. Suggested values for
the 'nstlbe' kernel config parameter would also be welcolmed.
Thanks in advance
DaveN.
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| Email: nixon@and.cs.liv.ac.uk |
---------------------------------mconway@hpcuhc.cup.hp.com (Michael Conway) (06/22/91)
>From djn@cs.liv.ac.uk >According to the manual Software Lookaside Buffers may help the >performance of Precision Architecture Machines with small >Hardware TLBs. Perhaps someone from HP would give an assessment >of the adequacy of the TLB on the HP-635. Suggested values for >the 'nstlbe' kernel config parameter would also be welcolmed. The software TLB is intended for use on systems with very small hardware TLBs such as the 808 and 815 which only have 64 entries. It is not supported on any other processors. I assume you are referring to an HP 9000 Model 635; if so the TLB has 4096 entries. This should be sufficient and the software TLB (even if it could be used) would not add any value since it uses (expensive) memory references to maintain the table. ---------------------------------------------------------------------------- Mike Conway - GSY Field Training - Hewlett Packard 19490 Homestead Road - Cupertino CA 95014 mikec@cup.hp.com