cygrunsrv + sshd + rsync = 20 times too slow -- throttled?
Takashi Yano
takashi.yano@nifty.ne.jp
Tue Aug 31 08:52:15 GMT 2021
On Mon, 30 Aug 2021 17:19:44 +0200
Corinna Vinschen wrote:
> On Aug 30 11:00, Ken Brown wrote:
> > On 8/30/2021 9:51 AM, Ken Brown wrote:
> > > On 8/30/2021 8:55 AM, Corinna Vinschen wrote:
> > > > On Aug 30 21:04, Takashi Yano wrote:
> > > > No worries. The same should apply to the NtCreateFile side of the
> > > > pipe, btw.
> > >
> > > I'll add my thanks. I should have checked the default flags that are
> > > typically used for other devices when I wrote nt_create. I'm glad you
> > > caught this.
> > >
> > > So I'll reinstate the use of nt_create and then let Takashi recheck everything.
> >
> > I've done this now. I'm still not sure I've got all the flags right. For
> > unknown reasons, I've used FILE_SHARE_READ | FILE_SHARE_WRITE in the call to
> > NtCreateNamedPipeFile, and no sharing in the call to NtOpenFile. Should I
> > also use FILE_SHARE_READ | FILE_SHARE in NtOpenFile? Is sharing even
> > relevant in this context?
>
> This is only relevant if you want to open the pipe from another context,
> calling CreateNamedPipe/CreateFile. As long as the pipe is only
> duplicated, it shouldn't matter at all.
>
> But, as I just wrote in my previous mail, the FILE_SYNCHRONOUS_IO_NONALERT
> flag is probably a good thing for C# apps, but not for Cygwin, because it
> enforces synchronous operation. Sorry about that...
With FILE_SYNCHRONOUS_IO_NONALERT, what kind of problems are you
specifically concerned about cygwin pipe?
--
Takashi Yano <takashi.yano@nifty.ne.jp>
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