From 49a086299e047b18280457b654790ef4a2e5abfa Mon Sep 17 00:00:00 2001 From: Samuel Thibault Date: Wed, 18 Feb 2015 00:58:35 +0100 Subject: Revert "rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn" This reverts commit 95878586ec7611791f4001a4ee17abf943fae3c1. --- open_issues/system_crash_pflocal_fifo.mdwn | 41 ++++++++++++++++++++++++++++++ 1 file changed, 41 insertions(+) create mode 100644 open_issues/system_crash_pflocal_fifo.mdwn (limited to 'open_issues/system_crash_pflocal_fifo.mdwn') diff --git a/open_issues/system_crash_pflocal_fifo.mdwn b/open_issues/system_crash_pflocal_fifo.mdwn new file mode 100644 index 00000000..1dddc44e --- /dev/null +++ b/open_issues/system_crash_pflocal_fifo.mdwn @@ -0,0 +1,41 @@ +[[!meta copyright="Copyright © 2010 Free Software Foundation, Inc."]] + +[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable +id="license" text="Permission is granted to copy, distribute and/or modify this +document under the terms of the GNU Free Documentation License, Version 1.2 or +any later version published by the Free Software Foundation; with no Invariant +Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license +is included in the section entitled [[GNU Free Documentation +License|/fdl]]."]]"""]] + +[[!tag open_issue_gnumach]] + +IRC, unknown channel, unknown date: + +`cat < /dev/zero | cat > /dev/null` will eventually make the system crash, +likewise when using a FIFO. + + hm... VM activity seems much higher when running fifo than pfinet... may be the cause + "zero filled" and "page faults" are serveral times higher with pipe than with pfinet + (cow faults however are about the same...) + pflocal is about the same as fifo + + no, because it usually takes like 20 minutes until it crashes, sometimes much longer + + not sure, but the longest so far was in the range of hours IIRC + + I think I never tested what happens on "cat /dev/zero >/dev/null"... another thing yet to try + + Linux BTW seems to employ some major VM trickery in this case -- dd shows a transfer rate of 10 GB/s... + + no, no anomalies in vmstat + the only observation I made is that number of page faults and some other number rise pretty quickly with pflocal and fifo, but not with pfinet + I guess that's somehow related to the fact that pfinet doesn't crash -- though I guess the difference is simply that pfinet is way slower... + (haven't checked that, though) + + BTW, I'm not sure you got it right: the test case is "cat /dev/zero|cat >/dev/null", *not* "cat /dev/zero >/dev/null" + + OK, "cat /dev/zero|tail -c 1" also crashes, so it's definitely not related to /dev/null + "dd if=/dev/zero|tail -c 1" crashes as well + but "tail -c 1 /dev/zero" doesn't seem to + cool... running multiple instances of the pipe test also considerably speeds up the crash -- cgit v1.2.3