From: Stas Sergeev <stsp@list.ru>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: Jarkko Huijts <jarkko.huijts@gmail.com>,
Alan Cox <alan@linux.intel.com>,
linux-usb@vger.kernel.org, linux-serial@vger.kernel.org,
Linux kernel <linux-kernel@vger.kernel.org>,
Caylan Van Larson <i@caylan.net>,
"Rafael J. Wysocki" <rjw@sisk.pl>
Subject: Re: Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012)
Date: Fri, 03 May 2013 22:15:14 +0400 [thread overview]
Message-ID: <5183FEB2.2090604@list.ru> (raw)
In-Reply-To: <20130503165231.GA1966@kroah.com>
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.
prev parent reply other threads:[~2013-05-03 18:15 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-03 15:02 Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012) Stas Sergeev
2013-05-03 16:30 ` Greg KH
2013-05-03 17:38 ` Stas Sergeev
2013-05-03 16:52 ` Greg KH
2013-05-03 18:05 ` Stas Sergeev
2013-05-03 17:16 ` Greg KH
2013-05-03 18:27 ` Stas Sergeev
2013-05-03 18:27 ` Stas Sergeev
2013-05-03 20:34 ` Greg KH
2013-05-03 20:34 ` Greg KH
[not found] ` <20130503203419.GA25932-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>
2013-05-03 21:50 ` Stas Sergeev
2013-05-03 21:50 ` Stas Sergeev
2013-05-04 11:15 ` Johan Hovold
2013-05-04 11:15 ` Johan Hovold
2013-05-04 11:39 ` Peter Hurley
2013-05-05 18:29 ` Johan Hovold
2013-05-05 18:32 ` [PATCH 0/7] USB: serial: add wait_until_sent-support Johan Hovold
2013-05-05 18:32 ` [PATCH 1/7] USB: serial: add wait_until_sent operation Johan Hovold
[not found] ` <1367778753-22297-1-git-send-email-jhovold-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2013-05-05 18:32 ` [PATCH 2/7] USB: serial: add generic wait_until_sent implementation Johan Hovold
2013-05-05 18:32 ` Johan Hovold
2013-05-08 14:25 ` Stas Sergeev
2013-05-08 14:25 ` Stas Sergeev
2013-05-08 15:48 ` Johan Hovold
2013-05-08 15:48 ` Johan Hovold
2013-05-08 15:51 ` [PATCH v2 2/8] " Johan Hovold
2013-05-05 18:32 ` [PATCH 3/7] USB: ftdi_sio: clean up get_modem_status Johan Hovold
2013-05-05 18:32 ` [PATCH 4/7] USB: ftdi_sio: fix chars_in_buffer overhead Johan Hovold
2013-05-05 18:32 ` [PATCH 5/7] USB: io_ti: " Johan Hovold
2013-05-05 18:32 ` [PATCH 6/7] USB: ti_usb_3410_5052: " Johan Hovold
2013-05-05 18:32 ` [PATCH 7/7] USB: serial: clean up chars_in_buffer Johan Hovold
[not found] ` <81D166EE-BB85-4A72-A6FA-A1F6B5633CB0@caylan.net>
2013-05-20 10:07 ` [PATCH 0/7] USB: serial: add wait_until_sent-support Johan Hovold
2013-05-04 12:44 ` Regression: ftdi_sio is slow (since Wed Oct 10 15:05:06 2012) Stas Sergeev
2013-05-04 12:44 ` Stas Sergeev
2013-05-04 9:37 ` Stas Sergeev
2013-05-04 9:37 ` Stas Sergeev
2013-05-03 18:15 ` Stas Sergeev [this message]
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