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This bug seems to particularly affect the Dell Latitude D420, D430 and
(from the kernel.org bug) at least the D830 laptop models; but others
have been reported.
Under I/O load, which need not be excessive - running usb-creator or
even just checking one's email - the system performs remarkably poorly,
far less than other laptop users see. It can often take minutes to open
a window, and sometimes the screen isn't repainted. Certainly most
applications are "dimmed" by Compiz under I/O.
It also appears to massively negatively affect boot performance, with
one core spending its entire time in I/O wait - something we don't see
elsewhere.
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: kj-triage needs-kernel-logs needs-upstream-testing
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Poor system performance under I/O load
https://bugs.launchpad.net/bugs/336652
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