Ubuntu
linux package

  1. Bug #131094
  2. Comment #143

Comment 143 for bug 131094

Revision history for this message
Thomas Pilarski (thomas.pi) wrote :

I have some new information on this topic. I tried to bypass the problem by using a fast SSD, but the desktop responsiveness becomes horrible. I think it's because I get only a write throughput of 20MB/s on sequential write access on the block devices. After some research, I got some new information. The problem is caused because there is no fair scheduling between read and write access.

https://fcp.surfsite.org/modules/newbb/viewtopic.php?viewmode=thread&topic_id=52598&forum=10&post_id=247938

After some more tests. I got these results.

# dd if=/dev/zero of=/dev/sda6 bs=1M count=1500
1572864000 Bytes (1,6 GB) kopiert, 57,5956 s, 27,3 MB/s
And poor desktop responsiveness.

# dd if=/dev/zero of=/dev/sda6 bs=1M count=1500 oflag=direct
1572864000 Bytes (1,6 GB) kopiert, 20,9958 s, 74,9 MB/s
And even firefox does not freeze.