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<H1>[Mageia-sysadm] 2010.1 kernel with the vmscan fix</H1>
<B>Buchan Milne</B>
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TITLE="[Mageia-sysadm] 2010.1 kernel with the vmscan fix">bgmilne at mandriva.org
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<I>Mon Nov 1 11:47:51 CET 2010</I>
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<PRE>On Sunday, 24 October 2010 07:28:55 Thomas Backlund wrote:
><i> Hi,
</I>><i> there is now a kernel-2.6.33.7-2.1mnb for 2010.1 at:
</I>><i>
</I>><i> <A HREF="http://tmb.mine.nu/Mandriva/2010.1/">http://tmb.mine.nu/Mandriva/2010.1/</A>
</I>><i> <A HREF="http://tmb2.mine.nu/Mandriva/2010.1/">http://tmb2.mine.nu/Mandriva/2010.1/</A>
</I>><i>
</I>><i> With the fix:
</I>><i> - vmscan: raise the bar to PAGEOUT_IO_SYNC stalls
</I>><i> (Fixes "system goes unresponsive under memory pressure and lots of
</I>><i> dirty/writeback pages" bug. (<A HREF="http://lkml.org/lkml/2010/4/4/86">http://lkml.org/lkml/2010/4/4/86</A>))
</I>><i>
</I>><i>
</I>><i> This was also suggested by blino to help the BS
</I>
This is definitely a huge improvement:
[<A HREF="https://www.mageia.org/mailman/listinfo/mageia-sysadm">root at tiger</A> ~]# uname -r
2.6.33.7-desktop-2.1mnb
[<A HREF="https://www.mageia.org/mailman/listinfo/mageia-sysadm">root at tiger</A> ~]# time dd if=/media/smartdrive/isos/mandriva/mandriva-linux-
free-2010-spring-i586/mandriva-linux-free-2010-spring-i586.iso
of=/dev/sdc;uptime
9107456+0 records in
9107456+0 records out
4663017472 bytes (4.7 GB) copied, 7075.81 s, 659 kB/s
4.83user 60.63system 1:57:55elapsed 0%CPU (0avgtext+0avgdata 3216maxresident)k
18186800inputs+9107456outputs (1major+260minor)pagefaults 0swaps
11:38:07 up 17:35, 21 users, load average: 4.57, 5.00, 5.23
While this was running, the system was quite responsive, in fact I didn't
notice that it was under load, whereas before, with dd'ing an ISO from a USB
hard drive to a slow USB flash disk, load average was higher, and my system
was almost unusable (even just switching between running applications was
tedious). Unfortunately, due to a 20-month-old having learned how to operate
switches, I booted into this kernel without notice, so I didn't validate my
previous experience on the previous kernel with exactly the same operation,
but I am quite sure I have experienced it before on 2.6.33.x.
Regards,
Buchan
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