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[Xen-users] Bad iSCSI I/O performance on Xen 4.6
- To: xen-users@xxxxxxxxxxxxxxxxxxxx
- From: Jean-Louis Dupond <jean-louis@xxxxxxxxx>
- Date: Mon, 8 Oct 2018 13:10:16 +0200
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- Delivery-date: Mon, 08 Oct 2018 11:17:39 +0000
- List-id: Xen user discussion <xen-users.lists.xenproject.org>
Hi,
We are hitting some I/O limitation on some of our Xen hypervisors.
The hypervisors are running CentOS 6 with Xen 4.6.6-12.el6 and 4.9.105+
kernels.
The hypervisors are attached with 10G network to the SAN network. And
there is no congestion at all.
Storage is exported via iSCSI and we use multipathd for failover.
Now we see a performance of +-200MB/sec write speed, but only a poor
20-30mb/sec read speed on a LUN on the SAN.
This is while testing this on dom0. Same speeds on domU.
If I do the same test on a Xen 4.4.4-34.el6 hypervisor to the same LUN
(but attached with 1G), I max out the link (100MB read/write).
On the same storage network we also have a bare metal machine, and there
we have 400-500MB/sec read-write performance on the same LUN!
So it really looks like the Xen 4.6 hypervisors are reaching some
bottleneck. But we couldn't locate it yet :)
The hypervisor's dom0 has 8 vCPU and 8GB RAM, which should be plenty!
Anything we could try to improve the speeds?
Thanks
Jean-Louis
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