From: Takashi Yano <takashi.yano@nifty.ne.jp>
To: cygwin@cygwin.com
Subject: Re: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?
Date: Sat, 28 Aug 2021 02:21:11 +0900 [thread overview]
Message-ID: <20210828022111.91ef5b4ff24f6da9fadb489e@nifty.ne.jp> (raw)
In-Reply-To: <4f2cb5f3-ce9c-c617-f65f-841a5eca096e@cornell.edu>
On Fri, 27 Aug 2021 12:00:50 -0400
Ken Brown wrote:
> On 8/27/2021 7:24 AM, Takashi Yano wrote:
> > On Thu, 26 Aug 2021 18:18:29 -0400
> > Ken Brown wrote:
> >> On 8/26/2021 11:56 AM, Ken Brown via Cygwin wrote:
> [...]
> >> In case you want to try out my proposed change, I've just rebased the patches to
> >> the current master and pushed them to a new topic/pipe branch.
> >
> > Hi Ken,
> >
> > Thanks much! I tested topic/pipe branch.
> >
> > [yano@cygwin-PC ~]$ scp test.dat yano@linux-server:.
> > yano@linux-server's password:
> > test.dat 100% 100MB 95.9MB/s 00:01
> > [yano@cygwin-PC ~]$ scp yano@linux-server:test.dat .
> > yano@linux-server's password:
> > test.dat 100% 100MB 8.0MB/s 00:12
> >
> > yano@linux-server:~$ scp yano@cygwin-PC:test.dat .
> > yano@cygwin-PC's password:
> > test.dat 100% 100MB 109.7MB/s 00:00
> > yano@linux-server:~$ scp test.dat yano@cygwin-PC:.
> > yano@cygwin-PC's password:
> > test.dat 100% 100MB 31.4MB/s 00:03
> >
> > As shown above, outgoing transfer-rate has been improved upto near
> > theoretical limit. However, incoming transfer-rate is not improved
> > much.
> >
> > I digged further and found the first patch attached solves the issue
> > as follows.
> >
> > [yano@cygwin-PC ~]$ scp yano@linux-server:test.dat .
> > yano@linux-server's password:
> > test.dat 100% 100MB 112.8MB/s 00:00
> >
> > yano@linux-server2:~$ scp test.dat yano@cygwin-PC:.
> > yano@cygwin-PC's password:
> > test.dat 100% 100MB 102.5MB/s 00:00
>
> Great!
>
> > I also tested the case:
> >>>> https://cygwin.com/pipermail/cygwin/2021-March/247987.html
> >>>> which seems to be the same issue with
> >>>> https://stackoverflow.com/questions/10385424/good-alternatives-to-cygwin-cygwin-doesnt-support-natively-support-win32-app
> >
> > Unfortunately, topic/pipe does not help.
> >
> > I confirmed that applying the second patch attached, which reverts
> > to create() rather than nt_create(), and setting CYGWIN=pipe_byte
> > fixes the problem.
> >
> > What do you think of this alternative implementation which does
> > not use nt_create()?
>
> Two years ago I thought I needed nt_create to avoid problems when calling
> set_pipe_non_blocking. Are you saying that's not an issue? Is
> set_pipe_non_blocking unnecessary? Is that the point of your modification to
> raw_read?
Yes. Instead of making windows read function itself non-blocking,
it is possible to check if the pipe can be read before read using
PeekNamedPipe(). If the pipe cannot be read right now, EAGAIN is
returned.
--
Takashi Yano <takashi.yano@nifty.ne.jp>
next prev parent reply other threads:[~2021-08-27 17:21 UTC|newest]
Thread overview: 86+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-24 19:49 Chris Roehrig
2021-08-24 23:43 ` Mark Geisert
2021-08-25 0:35 ` Chris Roehrig
2021-08-25 2:12 ` Chris Roehrig
2021-08-25 2:02 ` NightStrike
2021-08-25 3:20 ` Mark Geisert
2021-08-25 17:24 ` Chris Roehrig
2021-08-25 11:18 ` Takashi Yano
2021-08-25 17:31 ` Chris Roehrig
2021-08-25 17:52 ` Ken Brown
2021-08-25 18:18 ` Chris Roehrig
2021-08-25 18:51 ` Chris Roehrig
2021-08-26 15:44 ` Ken Brown
2021-08-25 20:33 ` Mario Emmenlauer
2021-08-26 15:47 ` Ken Brown
2021-08-25 21:29 ` Takashi Yano
2021-08-26 15:56 ` Ken Brown
2021-08-26 22:18 ` Ken Brown
2021-08-27 11:24 ` Takashi Yano
2021-08-27 16:00 ` Ken Brown
2021-08-27 17:21 ` Takashi Yano [this message]
2021-08-28 2:00 ` Takashi Yano
2021-08-28 3:03 ` Takashi Yano
2021-08-28 8:43 ` Corinna Vinschen
2021-08-28 9:41 ` Takashi Yano
2021-08-28 11:58 ` Corinna Vinschen
2021-08-28 15:43 ` Takashi Yano
2021-08-28 20:55 ` Ken Brown
2021-08-29 8:41 ` Takashi Yano
2021-08-29 22:42 ` Ken Brown
2021-08-29 10:27 ` Corinna Vinschen
2021-08-29 9:07 ` Takashi Yano
2021-08-29 15:57 ` Ken Brown
2021-08-29 19:24 ` Chris Roehrig
2021-08-29 22:24 ` Ken Brown
2021-08-30 23:58 ` Chris Roehrig
2021-08-31 19:05 ` Ken Brown
2021-08-31 19:53 ` Chris Roehrig
2021-08-31 20:23 ` Chris Roehrig
2021-08-31 21:29 ` Brian Inglis
2021-09-01 21:11 ` Chris Roehrig
2021-09-02 15:25 ` Ken Brown
2021-09-02 19:03 ` Chris Roehrig
2021-09-03 17:26 ` Ken Brown
2021-09-03 19:55 ` Corinna Vinschen
2021-09-03 20:59 ` Chris Roehrig
2021-09-04 8:32 ` Achim Gratz
2021-09-04 16:45 ` Brian Inglis
2021-09-05 8:18 ` Achim Gratz
2021-09-05 15:11 ` Brian Inglis
2021-09-06 10:42 ` Achim Gratz
2021-09-04 22:37 ` mmap failure [was: cygrunsrv + sshd + rsync = 20 times too slow -- throttled?] Ken Brown
2021-09-04 22:54 ` Ken Brown
2021-09-04 22:58 ` Ken Brown
2021-09-05 0:04 ` Ken Brown
2021-09-05 13:24 ` Ken Brown
2021-09-06 15:32 ` Corinna Vinschen
2021-09-06 17:12 ` Ken Brown
2021-09-06 17:38 ` Ken Brown
2021-09-06 17:43 ` Eliot Moss
2021-09-06 17:59 ` Corinna Vinschen
2021-09-06 18:07 ` Corinna Vinschen
2021-09-06 18:40 ` Ken Brown
2021-09-06 20:52 ` Peter Dons Tychsen
2021-09-06 20:54 ` Peter Dons Tychsen
2021-09-06 21:24 ` Ken Brown
2021-09-06 21:31 ` Ken Brown
2021-09-07 3:34 ` Brian Inglis
2021-09-07 16:28 ` Ken Brown
2021-09-07 21:52 ` Lavrentiev, Anton (NIH/NLM/NCBI) [C]
2021-09-07 22:44 ` Ken Brown
2021-09-08 6:14 ` Sam Edge
2021-09-08 8:18 ` Corinna Vinschen
2021-09-07 21:41 ` Peter Dons Tychsen
2021-09-04 23:18 ` Brian Inglis
2021-08-29 19:37 ` cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Takashi Yano
2021-08-29 21:09 ` Ken Brown
2021-08-29 21:04 ` Ken Brown
2021-08-30 0:13 ` Takashi Yano
2021-08-30 0:22 ` Takashi Yano
2021-08-30 2:15 ` Ken Brown
2021-08-30 8:02 ` Takashi Yano
2021-08-28 15:17 ` Ken Brown
2021-09-16 22:00 ` Keith Christian
2021-09-16 22:48 ` Ken Brown
2021-09-16 22:58 ` Keith Christian
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