On Tuesday 09 May 2006 08:29, Bharma Ji wrote: > I am trying to understand the difference in these three different memories. > Code comments in kern_malloc.c says that M_DEVBUF should be used for device > driver. I didn't however see any major difference between the three > memories. Can a device theoretically take up memory from M_TEMP (or > M_CACHE) segment? Similary can device drivers using M_DEVBUF also allocate > from M_CACHE / M_TEMP if needed.
The M_* stuff is just a categorisation for memory allocations. Run vmstat -m to see what I mean. AFAIK the actual take has no bearing on the performance of the allocation itself. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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