Messages in this thread | | | Date | Sun, 16 Jul 2006 10:43:46 +0200 | From | Carsten Otto <> | Subject | Re: Very poor IO performance (high CPU load), libata |
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Problem solved!
On Sat, Jul 15, 2006 at 07:45:57PM +0200, Carsten Otto wrote: > In the problem case the IO wait never drops below 40% no matter how light > the HDD load is. Logging in into the system via SSH then takes more than > two minutes and other tasks are equally slow.
Okay, the wait percentage is no problem, but the speed is. I had to use a second power supply for two of the four SATA disks, because the main supply is not good enough and causes crashes and reboots (see my other threads, I will answer there too). In a test that checked each disk seperately I noticed that exactly those disks connected to the second power supply perform very poor with write accesses (65 MB/sec vs. 2 MB/sec). I replaced the second (bad) power supply with a very good one and now all disks are working fine. My new main power supply should arrive soon.
I still can't understand why disks work slower when provided with "wrong" power... The disks are Maxtor MaXLine III 7V300F0.
> There might be a problem with my hardware (in a not yet determined > device) causing this problem. But as long as I do not know what is wrong > I still see the chance of a software error in the kernel.
Yeah, the kernel is okay :)
PS: Now a very annoying hunt for some error in my computer ends after about three weeks. The system now is stable and fast and I am happy...
Bye and sorry for bugging you, -- Carsten Otto c-otto@gmx.de www.c-otto.de - 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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