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Message-ID: <1572968467.2921.27.camel@suse.com>
Subject: Re: [PATCH 4.19 114/149] UAS: Revert commit 3ae62a42090f ("UAS: fix
 alignment of scatter/gather segments")
From:   Oliver Neukum <oneukum@suse.com>
To:     Alan Stern <stern@rowland.harvard.edu>
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Christoph Hellwig <hch@lst.de>
Date:   Tue, 05 Nov 2019 16:41:07 +0100
In-Reply-To: <Pine.LNX.4.44L0.1911051007140.1678-100000@iolanthe.rowland.org>
References: <Pine.LNX.4.44L0.1911051007140.1678-100000@iolanthe.rowland.org>
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Am Dienstag, den 05.11.2019, 10:09 -0500 schrieb Alan Stern:
> 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.

Damned if I do, damned if I do not.
Check for usbip and special case it?

	Regards
		Oliver