Poor disk performance of FreeBSD under AWS

[Julian Elischer]

On 18/03/2016 3:00 PM, huanghwh wrote:
> 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.
I think some people are already looking at this.. it's not limited to AWS.
>> any ideas?
>>
>> Huang Wen Hui
>>
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