[Samba] Problem with AIO random read

mikeliu mikeliu at qnap.com
Wed Dec 3 04:45:24 MST 2014

Hello list,

I setup Iometer to test AIO for 100% random read.
If "Transfer Request Size" is more than or equal to 256 kilobytes,in the
beginning the transmission is good.
But 3~5 seconds later,the throughput will drop to zero.

Server OS:
Ubuntu Server 14.04.1 LTS

Version 4.1.6-Ubuntu

SMB 2.0

AIO settings :
aio read size = 1
aio write size = 1
vfs objects = aio_pthread

Client OS:
Win 8.1 professional 64Bit

Iometer Setting:
Iometer 2006.07.27
Worker : 8
Max Disk Size (Sectors) : 16777216
Outstanding I/Os : 128
Starting Disk Sector : 0
100% Random read

Any insight into why this is so and any other tuning suggestion is 



View this message in context: http://samba.2283325.n4.nabble.com/Problem-with-AIO-random-read-tp4677191.html
Sent from the Samba - General mailing list archive at Nabble.com.

More information about the samba mailing list