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Date: Thu, 03 Jan 2013 05:41:09 -0800 From: Eric Dumazet <eric.dumazet@...il.com> To: Eric Wong <normalperson@...t.net> Cc: Mel Gorman <mgorman@...e.de>, linux-mm@...ck.org, netdev@...r.kernel.org, linux-kernel@...r.kernel.org, Rik van Riel <riel@...hat.com>, Minchan Kim <minchan@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Linus Torvalds <torvalds@...ux-foundation.org> Subject: Re: ppoll() stuck on POLLIN while TCP peer is sending On Wed, 2013-01-02 at 20:47 +0000, Eric Wong wrote: > Eric Wong <normalperson@...t.net> wrote: > > [1] my full setup is very strange. > > > > Other than the FUSE component I forgot to mention, little depends on > > the kernel. With all this, the standalone toosleepy can get stuck. > > I'll try to reproduce it with less... > > I just confirmed my toosleepy processes will get stuck while just > doing "rsync -a" between local disks. So this does not depend on > sendfile or FUSE to reproduce. > -- How do you tell your 'toosleepy' is stuck ? If reading its output, you should change its logic, there is no guarantee the recv() will deliver exactly 16384 bytes each round. With the following patch, I cant reproduce the 'apparent stuck' diff --git a/toosleepy.c b/toosleepy.c index e64b7cd..df3610f 100644 --- a/toosleepy.c +++ b/toosleepy.c @@ -15,6 +15,7 @@ #include <fcntl.h> #include <assert.h> #include <limits.h> +#include <time.h> struct receiver { int rfd; @@ -53,6 +54,7 @@ static void * recv_loop(void *p) ssize_t r, s; size_t received = 0; size_t sent = 0; + time_t t0 = time(NULL), t1; for (;;) { r = recv(rcvr->rfd, buf, sizeof(buf), 0); @@ -80,9 +82,12 @@ static void * recv_loop(void *p) write(-1, buf, sizeof(buf)); } } - if ((received % (sizeof(buf) * sizeof(buf) * 16) == 0)) + t1 = time(NULL); + if (t1 != t0) { dprintf(2, " %d progress: %zu\n", rcvr->rfd, received); + t0 = t1; + } } dprintf(2, "%d got: %zu\n", rcvr->rfd, received); if (rcvr->sfd >= 0) { -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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