Hi

On 11.06.2015 07:46, Axel Christiansen wrote:
> Hello List.
> 
> 
> I am having trouble solving a problem with a bunch of USB3-SATA-bridge 
> connected to 2 USB3-hubs. I was not able finding any useful help for weeks 
> now.
> 
> Perhaps by bringing this issue to linux-usb can help me troubleshot the 
> problem or sort out a bug or help improve Linux USB stability.
> 
> The issue is an ongoing reset of different JMicron (ID 152d:0567) JMS567  
> USB3-SATA-bridges partitioned equally to 2 USB3-hubs (ID 2109:0812).
> 
> I have 8 of theses bridges with 8 3TB WD (WDC WD30EZRX) hard drives connected 
> to them. That 8 drives are configured running as a raid6.
> 
> Reading/writing using 1 hard disk at a time works fine, even with higher 
> speeds using dd or copying large files. Using several drives simultaneously 
> is causing ongoing resets on a number of these bridges randomly (but 1 a 
> time). It is like reading for seconds, then the read blocks for may by 5 
> seconds, a reset on one bridge happens and the reading continues.
> 
> The host is a Debian 8 with Linux 3.16.0-4-amd64.
> 
> What i noticed today was, by lowering max_sectors to 16 or 8 improves 
> stability much, but it is still fare from stable.
> 
> 
> What could be done improving this?
> Are there any quirks worth trying?
> 
> 
> Any idea would be much appreciated. Axel
> 

At least xhci has several improvements since 3.16, 
Can you try to reproduce this with a more recent kernel? 
4.1-rc7 preferably, or 4.1 final once it's out. 

-Mathias

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