Re: usb-storage: Set virt_boundary_mask to avoid SG overflows

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On Mon, 4 Nov 2019, Daniel Walker wrote:

> Hi,
> 
> This is a stable defect report.
> 
> We're tracking v4.9 stable for some of our products (i.e. Cisco Systems, Inc.)
> We noticed a speed degradation of roughly %30 on writes to a /dev/sdaX device
> over USB (no file system). We bisected the issue to this commit from Alan Stern.
> We also found a prior report of speed degradation on NTFS,
> 
> https://lore.kernel.org/linux-usb/Pine.LNX.4.44L0.1908291030400.1306-100000@xxxxxxxxxxxxxxxxxxxx/T/
> 
> We have the patch reverted in our v4.9 tree on top of stable. It seems Alan was
> planning to remove these lines. If the lines are planned to be removed is there
> an reason why they haven't been ?

See https://marc.info/?l=linux-usb&m=157167288816325&w=2

Alan Stern




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