Red Hat Bugzilla – Bug 217257
repeated AIO+DIO virtually locks disc I/O completely.
Last modified: 2008-02-07 23:26:48 EST
Description of problem:
I stumbled upon this problem when researching Bug #217098. If you do AIO+DIO to
the same destination over and over again in a loop, it effectively stops all
other disc I/O.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1. gcc -g -Wall -O2 aiodio_dos.c -o aiodio_dos -laio
3. (on some other terminal) ls /usr/bin (or any other operation involving disc I/O)
Actual results: ls /usr/bin does not complete until you interrupt aiodio_dos
Expected results: aiodio_dos shouldn't be able to keep other processes I/O from
the blockage is not even local to the disc it transfers to.
Created attachment 142126 [details]
Same problem occurs on non-xen (2.6.18-1.2849.fc6) kernel.
(This is a mass-update to all current FC6 kernel bugs in NEW state)
I'm reviewing this bug list as part of the kernel bug triage project, an attempt
to isolate current bugs in the Fedora kernel.
I am CC'ing myself to this bug, however this version of Fedora is no longer
Please attempt to reproduce this bug with a current version of Fedora (presently
Fedora 8). If the bug no longer exists, please close the bug or I'll do so in a
few days if there is no further information lodged.
Thanks for using Fedora!
Per the previous comment in this bug, I am closing it as INSUFFICIENT_DATA,
since no information has been lodged for over 30 days.
Please re-open this bug or file a new one if you can provide the requested data,
and thanks for filing the original report!