From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin@cygwin.com
Subject: Re: X11 forwarding extremely slow (unusable) after Cygwin upgrade (starting from cygwin1.dll version 3.1.0-0.4)
Date: Sat, 04 Jan 2020 01:51:00 -0000 [thread overview]
Message-ID: <20200104105142.699b9d6f7a518b51ea24b738@nifty.ne.jp> (raw)
In-Reply-To: <535e7760-f4da-2018-1dee-1c9bf2ea6cc9@cornell.edu>
On Thu, 2 Jan 2020 22:16:02 +0000
Ken Brown wrote:
> I think this narrows it down to one of the following commits:
I looked into this probelm and found the issue occurs after
the following commit.
> commit 915fcd0ae8d83546ce135131cd25bf6795d97966
> Author: Takashi Yano <takashi.yano@nifty.ne.jp>
> Date: Thu Sep 5 13:22:54 2019 +0900
>
> Cygwin: pty: Fix select() with pseudo console support.
I investigated this deeper, and found:
1) xterm in ssh -Y session calls select() about 1000 times
at startup.
2) pi->thread->detach() in pty_slave_cleanup() takes about
20usec in usual, however, it takes more than 10msec
in ssh -Y session.
As a result, start up of xterm takes more than 10 sec.
I have no idea so far why cygthread::detach() becomes
so slow in ssh -Y session. :-(
--
Takashi Yano <takashi.yano@nifty.ne.jp>
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next prev parent reply other threads:[~2020-01-04 1:51 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-02 21:26 ianpul01
2020-01-02 22:16 ` Ken Brown
2020-01-04 1:51 ` Takashi Yano [this message]
2020-01-06 14:40 ` Takashi Yano
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