Hi. Maybe someone can give us a hint or direct us in the right direction.
We have a debian testing system. uname -a shows: Linux sv-vmhost02 2.6.18-4-amd64 #1 SMP Mon Mar 26 11:36:53 CEST 2007 x86_64 GNU/Linux The machine seems to freeze every n seconds for some seconds. It can be easily seen when doing disk io. Here is an example: sv-vmhost02:/home# date ; time dd if=/dev/zero of=test.dat bs=1MB count=1000 ; date Thu May 10 17:53:45 CEST 2007 1000+0 records in 1000+0 records out 1000000000 bytes (1.0 GB) copied, 2.89129 seconds, 346 MB/s real 0m58.632s user 0m0.000s sys 0m3.480s Thu May 10 17:54:44 CEST 2007 sv-vmhost02:/home# The date output shows that the dd did run from 17:53:45 to 17:54:44. But the dd command thinks it only took 2.8 seconds to create the 1 GB file -of course with a top thruput of 346 MB/s. But the time-command shows that the dd really took 58 seconds. So the real thruput was around 17 MB/s So i think the whole hardware is freezing an the os does not see it because there are no error messages in dmesg. When doing a "iostat -mxtc 1" during the dd it is shown that write thruput of the /dev/sda drops to zero for seconds (typically 10 seconds) and then rises again. Any idea where to start searching for? Thx Andi -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
