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Message-ID: <AANLkTi=uOpN0PwWdGh6iri-vJwuMS+WMPxmaZjv0-TrV@mail.gmail.com>
Date: Mon, 31 Jan 2011 20:28:00 +0100
From: Jindřich Makovička <makovick@...il.com>
To: linux-kernel@...r.kernel.org
Cc: Jindřich Makovička <makovick@...il.com>
Subject: khugepaged: gets stuck when writing to USB flash, 2.6.38-rc2
Hi,
I am encountering problems when continuously writing larger amounts of
data to a USB flash drive. My configuration is
x86-64 kernel
USB stick with 10MB/s write, 30MB/s read speed,
HDD with ~60-80MB/s read/write
8 GiB RAM
When copying 4GB or more in one go from HDD to Flash, during the
copying, fork() and probably other syscalls involving VM start
blocking (I first observed the problem in Chrome, which refused to
display content in new tabs). When one lets the copying finish, the
system returns to a usable state.
During the limbo, khugepaged is in D state (uninterruptible sleep).
Syslog doesn't seem to contain anything of interest.
After
echo never > /sys/kernel/mm/transparent_hugepage/enabled
copying works ok.
Regards,
--
Jindrich Makovicka
Download attachment "config-2.6.38-rc2" of type "application/octet-stream" (77593 bytes)
Download attachment "dmesg" of type "application/octet-stream" (49969 bytes)
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