From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from conssluserg-01.nifty.com (conssluserg-01.nifty.com [210.131.2.80]) by sourceware.org (Postfix) with ESMTPS id B2A87383F87B for ; Sat, 4 Sep 2021 23:15:41 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org B2A87383F87B Authentication-Results: sourceware.org; dmarc=fail (p=none dis=none) header.from=nifty.ne.jp Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=nifty.ne.jp Received: from Express5800-S70 (z221123.dynamic.ppp.asahi-net.or.jp [110.4.221.123]) (authenticated) by conssluserg-01.nifty.com with ESMTP id 184NFFxE015131 for ; Sun, 5 Sep 2021 08:15:15 +0900 DKIM-Filter: OpenDKIM Filter v2.10.3 conssluserg-01.nifty.com 184NFFxE015131 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nifty.ne.jp; s=dec2015msa; t=1630797315; bh=O4s5ttJx0jH7q92K3ZEOcYu/jWPlDlFjRu0RGmRAxGg=; h=Date:From:To:Subject:In-Reply-To:References:From; b=RbBhRV2LYBExyFI+fq0Vw64j2t9g6y+qvGvrwRHy7MPmyzLDrxGlkeL+unNRXJl7T phsBy7+g44rd4IIhm9Mn66XxYqeMevViFpXVA0Jf8yFu6z6LmexmOJ9UyUY3zhxXNP LJgTwNcko6gCmhUV30EmTVFsOBq2NgB8zJXdsnHhoTDJwRMwan37uEsMb5oOpAfOvB 0xNfk49/mqfJJnu7kDwIfFaIOnC3aP0HN0DjugHiLOfZ9mJLteaWrDyk8u4jaKkYxd m7zCr2r7Vx3vLaDNNwU6DhH3Lz+OSX2oWdJv3/ZLiagAb26SWVIUbbi/tRSG5I0zMs CJ6NXiUv3145A== X-Nifty-SrcIP: [110.4.221.123] Date: Sun, 5 Sep 2021 08:15:23 +0900 From: Takashi Yano To: cygwin-developers@cygwin.com Subject: Re: cygrunsrv + sshd + rsync = 20 times too slow -- throttled? Message-Id: <20210905081523.0db04d9402abf87635066eb7@nifty.ne.jp> In-Reply-To: <51cb0cef-c3fd-1320-c2dd-a868bf1ffaae@cornell.edu> References: <9ba687eb-f4a0-18f8-b10b-76e7e51e123e@cornell.edu> <152bfc0c-2f72-c684-6fc5-aa7c36c136b8@cornell.edu> <20210903190046.663c60fb11c936e344821383@nifty.ne.jp> <20210903191340.c28ae366e79ca14799bacc1f@nifty.ne.jp> <20210903212205.acc2fc68cc4ffce9c1db3dd9@nifty.ne.jp> <20210904210258.342eb795ac53f1d5352ea512@nifty.ne.jp> <20210904213713.8760e7ba3a4d68fbb78d677e@nifty.ne.jp> <51cb0cef-c3fd-1320-c2dd-a868bf1ffaae@cornell.edu> X-Mailer: Sylpheed 3.7.0 (GTK+ 2.24.30; i686-pc-mingw32) Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="Multipart=_Sun__5_Sep_2021_08_15_23_+0900_LTIyAV_6reWjAaqI" X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, NICE_REPLY_A, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2, SPF_HELO_NONE, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.4 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on server2.sourceware.org X-BeenThere: cygwin-developers@cygwin.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Cygwin core component developers mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 04 Sep 2021 23:15:49 -0000 This is a multi-part message in MIME format. --Multipart=_Sun__5_Sep_2021_08_15_23_+0900_LTIyAV_6reWjAaqI Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Hi Ken, On Sat, 4 Sep 2021 10:04:12 -0400 Ken Brown wrote: > On 9/4/2021 8:37 AM, Takashi Yano wrote: > > On Sat, 4 Sep 2021 21:02:58 +0900 > > Takashi Yano wrote: > >> Hi Corinna, Ken, > >> > >> On Fri, 3 Sep 2021 09:27:37 -0400 > >> Ken Brown wrote: > >>> On 9/3/2021 8:22 AM, Takashi Yano wrote: > >>>> POSIX says: > >>>> The value returned may be less than nbyte if the number of bytes left > >>>> in the file is less than nbyte, if the read() request was interrupted > >>>> by a signal, or if the file is a pipe or FIFO or special file and has > >>>> ~~~ > >>>> fewer than nbyte bytes immediately available for reading. > >>>> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ > >>>> > >>>> https://pubs.opengroup.org/onlinepubs/009604599/functions/read.html > >>>> > >>>> If it is turned over, read() should read all data immediately available, > >>>> I think. > >>> > >>> I understand the reasoning now, but I think your patch isn't quite right. As it > >>> stands, if the call to NtQueryInformationFile fails but total_length != 0, > >>> you're trying to read again without knowing that there's data in the pipe. > >>> > >>> Also, I think you need the following: > >>> > >>> diff --git a/winsup/cygwin/fhandler_pipe.cc b/winsup/cygwin/fhandler_pipe.cc > >>> index ef7823ae5..46bb96961 100644 > >>> --- a/winsup/cygwin/fhandler_pipe.cc > >>> +++ b/winsup/cygwin/fhandler_pipe.cc > >>> @@ -348,8 +348,13 @@ fhandler_pipe::raw_read (void *ptr, size_t& len) > >>> CloseHandle (evt); > >>> if (status == STATUS_THREAD_SIGNALED) > >>> { > >>> - set_errno (EINTR); > >>> - len = (size_t) -1; > >>> + if (total_len == 0) > >>> + { > >>> + set_errno (EINTR); > >>> + len = (size_t) -1; > >>> + } > >>> + else > >>> + len = total_len; > >>> } > >>> else if (status == STATUS_THREAD_CANCELED) > >>> pthread::static_cancel_self (); > >> > >> Thanks for your advice. I fixed the issue and attached new patch. > >> > >> On Fri, 3 Sep 2021 17:37:13 +0200 > >> Corinna Vinschen wrote: > >>> Hmm, I see the point, but we might have another problem with that. > >>> > >>> We can't keep the mutex while waiting on the pending read, and there > >>> could be more than one pending read running at the time. if so, > >>> chances are extremly high, that the data written to the buffer gets > >>> split like this: > >>> > >>> reader 1 reader 2 > >>> > >>> calls read(65536) calls read(65536) > >>> > >>> calls NtReadFile(16384 bytes) > >>> calls NtReadFile(16384 bytes) > >>> > >>> writer writes 65536 bytes > >>> > >>> wakes up and gets 16384 bytes > >>> wakes up and gets 16384 bytes > >>> gets the mutex, calls > >>> NtReadFile(32768) which > >>> returns immediately with > >>> 32768 bytes added to the > >>> caller's buffer. > >>> > >>> so the buffer returned to reader 1 is 49152 bytes, with 16384 bytes > >>> missing in the middle of it, *without* the reader knowing about that > >>> fact. If reader 1 gets the first 16384 bytes, the 16384 bytes have > >>> been read in a single call, at least, so the byte order is not > >>> unknowingly broken on the application level. > >>> > >>> Does that make sense? > >> > >> Why can't we keep the mutex while waiting on the pending read? > >> If we can keep the mutex, the issue above mentioned does not > >> happen, right? > >> > >> What about the patch attached? This keeps the mutex while read() > >> but I do not see any defects so far. > > LGTM. > > If Corinna agrees, I have a couple of suggestions. > > 1. With this patch, we can no longer have more than one pending ReadFile. So > there's no longer a need to count read handles, and the problem with select is > completely fixed as long as the number of bytes requested is less than the pipe > buffer size. > > 2. raw_read is now reading in chunks, like raw_write. For readability of the > code, I think it would be better to make the two functions as similar as > possible. For example, you could replace the do/while loop by a > while(total_len variables, e.g., nbytes instead of total_len, or vice versa. Thanks for the suggestion. I have rebuilt the patch. Please see the patch attached. -- Takashi Yano --Multipart=_Sun__5_Sep_2021_08_15_23_+0900_LTIyAV_6reWjAaqI Content-Type: application/octet-stream; name="0001-Cygwin-pipe-Stop-counting-reader-and-read-all-availa.patch" Content-Disposition: attachment; filename="0001-Cygwin-pipe-Stop-counting-reader-and-read-all-availa.patch" Content-Transfer-Encoding: base64 RnJvbSAzMzhjMWVkOWUyNjBkNWQ0NTYzNTRlYTU5ODUwMDJkMTkxNTE2OGI1IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiBUYWthc2hpIFlhbm8gPHRha2FzaGkueWFub0BuaWZ0eS5uZS5q cD4KRGF0ZTogU3VuLCA1IFNlcCAyMDIxIDA2OjEwOjI5ICswOTAwClN1YmplY3Q6IFtQQVRDSF0g Q3lnd2luOiBwaXBlOiBTdG9wIGNvdW50aW5nIHJlYWRlciBhbmQgcmVhZCBhbGwgYXZhaWxhYmxl CiBkYXRhLgoKLSBCeSBndWFyZGluZyByZWFkIHdpdGggcmVhZF9tdHgsIG5vIG1vcmUgdGhhbiBv bmUgUmVhZEZpbGUgY2FuCiAgYmUgY2FsbGVkIHNpbXVsdGFuZW91c2x5LiBTbyBjb3V0aW5nIHJl YWQgaGFuZGxlcyBpcyBubyBsb25nZXIKICBuZWNlc3NhcnkuCi0gTWFrZSByYXdfcmVhZCBjb2Rl IGFzIHNpbWlsYXIgYXMgcG9zc2libGUgdG8gcmF3X3dyaXRlIGNvZGUuCi0tLQogd2luc3VwL2N5 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