Re: Why is HZ on an Alpha 1024?

Thomas Pornin (bip@orion.ens.fr)
Fri, 1 May 1998 10:38:29 +0200

In article <199805010256.TAA19303@sun4.apsoft.com> you write:
>I have a 166Mhz UDB, and the machine is doggish. I had the
>thought of chaning Hz to be 100, like in the PC. The Rubini
>book states that the higher the HZ, the more interrupt overhead
>you incurr...I've got a SLOW Alpha. Would this help the Alpha?
>Why was 1024 chosen by the Kernel Gods???

A 166MHz UDB is slow anyway. There is a big difference between the 21064
processor series (such as in the UDB) and the 21164 series. Moreover,
the harddisk embedded in UDBs is sloooooow; and gcc is goofy on such
processors, and takes much time to optimize.

1024 has been chosen because 1000 is not a power of 2.

--Thomas Pornin

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