Comment 130 for bug 197762
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| Kurt De Smet (nihilus-dommel) wrote Re: file transfers on USB disk are very slow | #130 |
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0e1f616
(Get the code!)
Hi Lucas,
I noticed everything goes fine until the memory gets full, then starts the swapping and the slowdown. It's like the memory is used as buffer, when that runs out it uses the virtual memory on the HD. No problem with small sizes that fit the memory but when you select 100 GB at once ... then the HD starts writing to itself fairly rapidly. When AHCI was enabled the memory gets used to but strangely enough it does not use the virtual memory (NCQ?). As you stated the NCQ may prevents the HD from playing with itself. It may not be the main problem (that's why I didn't file a bug) but I'm fairly sure some people have IDE selected or only have IDE in their BIOS. I only thought it was worth mentioning how I solved my problem because I read very similar stories to mine here. It could be good to know if they are using a PATA or SATA drive as source. Once you filter those out you can narrow down to the real problem.