Messages in this thread |  | | | From | Denis Vlasenko <> | | Subject | Re: Machine's high load when HIGHMEM is enabled | | Date | Sun, 3 Nov 2002 22:43:08 -0200 |
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On 3 November 2002 13:00, Jens Axboe wrote: > On Sun, Nov 03 2002, Brian Gerst wrote: > > vasya vasyaev wrote: > > >Hello, > > > > > >I have some strange kind of problem: > > >When HIGHMEM-enabled kernel is used, there is too high > > >CPU load on any task - computer get loaded high while > > >it is doing some minor, usual jobs (load average grows > > >significantly). > > > > 2.4 can only do I/O to and from lowmem. This means highmem pages > > have > > 2.4.19 and below, 2.4.20-pre/rc can dma to/from highmem pages just > fine. > > > to use bounce buffers in lowmem, and th edata is copied to/from > > highmem which is causing the cpu load. This has been corrected in > > 2.5, which can do I/O to any page the device can DMA from. > > I seriously doubt this is his problem, sounds like something else. > For gzip to be disk bound (and thus bounce bound) you would need a > seriously fast cpu. And the ssh problem cannot be explained by > bouncing either.
bad mtrr? -- vda - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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