Ubuntu
linux package

  1. Bug #620074
  2. Comment #158

Comment 158 for bug 620074

Revision history for this message
In , bart (bart-linux-kernel-bugs) wrote :

Created attachment 20148
Graph of I/O waits on CPU Core 0

Running dd if=/dev/zero of=/storage/hwraid0/test1 bs=1M count=1M

On my AMD Phenom 9950 Quad-Core Processor running a distro kernel (2.6.27.12-170.2.5.fc10.x86_64). This test was run against a XFS file system on a 8 disk PCI-Express hardware RAID card. I also get the same if I run against ext4 on the same hardware. I also get similar results with this machine on a single 10,000RPM drive connected to the motherboards SATA with ext4.

When this test was running the system was very unresponsive. In a different test run I launched evolution and it took around 60 seconds to load.

[root@bajor hwraid0]# dd if=/dev/zero of=/storage/hwraid0/test1 bs=1M count=1M
436560+0 records in
436560+0 records out
457766338560 bytes (458 GB) copied, 2535.92 s, 181 MB/s