linux-kernel - Re: [PATCH 4.19 114/149] UAS: Revert commit 3ae62a42090f ("UAS: fix alignment of scatter/gather segments")

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Date:   Tue, 5 Nov 2019 10:09:54 -0500 (EST)
From:   Alan Stern <stern@...land.harvard.edu>
To:     Oliver Neukum <oneukum@...e.com>
cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>,
        Christoph Hellwig <hch@....de>
Subject: Re: [PATCH 4.19 114/149] UAS: Revert commit 3ae62a42090f ("UAS: fix
 alignment of scatter/gather segments")

On Tue, 5 Nov 2019, Oliver Neukum wrote:

> Am Montag, den 04.11.2019, 22:45 +0100 schrieb Greg Kroah-Hartman:
> >         Since commit ea44d190764b ("usbip: Implement SG support to
> >         vhci-hcd and stub driver") was merged, the USB/IP driver can
> >         also handle SG.
> 
> Hi,
> 
> same story as 4.4.x

I'm not sure about uas, but it was reported just yesterday that the 
corresponding commit for usb-storage caused a 30% speed degradation:

	https://marc.info/?l=linux-usb&m=157293660212040&w=2

Given this information, perhaps you will decide that the revert is 
worthwhile.

Alan Stern