[Samba] Problem with AIO random read

mikeliu
Wed, 03 Dec 2014 11:45:24 -0000

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

Samba:
Version 4.1.6-Ubuntu

Dialect:
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
appreciated.

Thanks.

Regards,
Mike



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