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Re: [Xen-users] poor I/O with xen kernel

More info about this:

filename:       /lib/modules/3.13.0-32-generic/kernel/drivers/scsi/megaraid/megaraid_sas.ko
description:    LSI MegaRAID SAS Driver
author:         megaraidlinux@xxxxxxx
version:        06.700.06.00-rc1

this is the kernel and the driver version on both Xen and Non-Xen version of Ubuntu Server

And this is the Xen kernel and driver version on CentOS

filename: /lib/modules/3.13.0-32-generic/kernel/drivers/scsi/megaraid/megaraid_sas.ko
description: LSI MegaRAID SAS Driver
author: megaraidlinux@xxxxxxx
version: 06.700.06.00-rc1
license: GPL

and the Intel Raid controller version:

82:00.0 RAID bus controller: LSI Logic / Symbios Logic MegaRAID SAS-3 3108 [Invader] (rev 02)


The Areca Raid Version is:

02:00.0 RAID bus controller: Areca Technology Corp. ARC-1880 8/12 port PCIe/PCI-X to SAS/SATA II RAID Controller (rev 01)

the Xen and non-xen Kernels are the same as above

is any body else is having this issue ?



On 27/01/15 13:28, Niki Vasilev wrote:
Hi there,

I have some issues with Xen kernel on Ubuntu Server (latest) and CentOS 6

I am using Intel RAID controller, testing with fio.

On CentOS 6 I am getting ~14k iops with Xen Kernel and with the generic one I am getting ~15k (not much more ...). I played with drivers, changed the scheduler, etc....nothing helped.

On Ubuntu Server with the default kernel and driver I am getting ~21k iops and when I boot with xen kernel I am getting ~10k ....its the same kernel version and same driver ...

On the same machine with Areca raid controller with CentOS 6 and xen kernel I am getting ~26k iops

My question is, how can I modified the kernel or what I have to install/config to solve this ...



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