Messages in this thread | ![/](/images/icornerl.gif) | | Date | Mon, 8 Dec 2003 10:58:26 -0500 | From | Hank Leininger <> | Subject | Re: 2.4: mylex and > 2GB RAM |
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On 2003-12-08, Per Buer <perbu () linpro ! no> wrote:
> I have an Supermicro Superserver (wow!) 8040 or 8060 with a two Intel > Xeon (p3-based with 1MB cache) and a Mylex AcceleRAID 352. We recently > upgraded from 2 to 4GB of memory.
> There seems to a problem with IO and high memory. Suddenly IO > performance will degrade dramatically (throughput of about 50KB/s). > Booting the machine with "mem=2048" remedies this.
> We have tried replacing the memory with another make - no luck.
You don't mention the kernel version--I'm guessing a 2.4.x?
This doesn't necessarily help you, but: I haven't seen that on a dual P3 with 3GB of RAM (configured with CONFIG_HIGHMEM4G=y, CONFIG_HIGHMEM=y and CONFIG_HIGHIO=y) and an AcceleRAID 352, in 2.4.22. (I did get oopses with this card and 3GB in 2.2 kernel days, using the old bigmem patches for 2.2. I didn't stick around to find out whose fault it was though, just dropped back to 2GB)
So, try verifying you've got CONFIG_HIGHIO=y, and out of curiosity you could try mem=3072, but if that doesn't help I'd suspect the motherboard. This box is... um... an Intel serverworks board whose exact model number escapes me at the moment.
-- Hank Leininger <hlein@progressive-comp.com> - 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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