From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jonathan Tripathy Subject: Windows IOPS Benchmark Date: Thu, 30 Aug 2012 01:09:10 +0100 Message-ID: <503EAF26.6020009@abpni.co.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Sender: linux-bcache-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: "linux-bcache-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" List-Id: linux-bcache@vger.kernel.org Hi Everyone, I'm using bcache with a RAID1 pair of SSDs (for the cache) with a MD-RAID10 spindle array for the backing device. On top of this is LVM. This setup is used with the Xen Hypervisor. Bcache is formatted with a sector size of 512 bytes. If I use an LV for a Linux DomU, I get fantastic disk performance using fio (about 23k random write). However, when I use IOMeter in a Windows HVM DomU (with GPLPV drivers installed), my avg IOPS is around 4000. I am using the "default" Access Specification. Am I doing something wrong? Changing the number of workers doesn't seem to help. Any advice is appreciated. Thanks