Poor disk performance of FreeBSD under AWS

[huanghwh]

BTW, with 1G ram configuration, vi can exit very quickly.
At 2016-03-18 14:26:14, "huanghwh" <huanghwh at 163.com> wrote:
>I have a EC2 server in AWS, 4CPU+16G ram, FreeBSD 10.2R.
>
>Use two command dd and vi:
>dd if=/dev/zero of=/.swap bs=1M count=8192 & 
>
>8589934592 bytes transferred in 117.074462 secs (73371549 bytes/sec)
>
>when dd run in background, input vi command  to edit a small txt file "d.txt" at same time,
>
>and then write and quit immediately:
>
>
>/usr/bin/time vi d.txt
>
>
>49.82 real 0.00 user 0.00 sys 
>
>in top command show:
>810 root 1 23 0 12344K 2524K wswbuf 0 0:04 5.76% dd 
>821 root 1 20 0 23448K 4092K wdrain 0 0:00 0.00% vi 
>
>vi need almost 50 seconds to quit.
>
>any ideas?
>
>Huang Wen Hui
>
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