linux-kernel - Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

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Message-ID: <5183FEB2.2090604@list.ru>
Date:	Fri, 03 May 2013 22:15:14 +0400
From:	Stas Sergeev <stsp@...t.ru>
To:	Greg KH <gregkh@...uxfoundation.org>
CC:	Jarkko Huijts <jarkko.huijts@...il.com>,
	Alan Cox <alan@...ux.intel.com>, linux-usb@...r.kernel.org,
	linux-serial@...r.kernel.org,
	Linux kernel <linux-kernel@...r.kernel.org>,
	Caylan Van Larson <i@...lan.net>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)

03.05.2013 20:52, Greg KH пишет:
> What exactly is the "problem" being seen?
OK, the problem is that while select() "stalls", the entire
output queue is transmitted, and when the app writes
more, there is already a big pause.
In fact, the app calls select() before writing every char,
so then the data transfer is very slow.
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