Hi list,
i found a strange ext4 (?) effect.

when i write to a disk:
dd if=/dev/zero of=xx bs=1G count=1

reports 2.6 GB (expected)
doing again speed drops to 200MB.

removing xx restores old speed.

I ask the net and it seems that the effect is there
since kernel 2.6. I found the explainations a bit confusing.

does anyone know more ?

note: i was analysing a performace issue for mysql and i am
not sure if that problems matters outside tests.

re
rp