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| author | "Dube, Lutz" <lutz.dube@ts.fujitsu.com> | 2010-07-23 17:34:35 +0100 |
|---|---|---|
| committer | "Dube, Lutz" <lutz.dube@ts.fujitsu.com> | 2010-07-23 17:34:35 +0100 |
| commit | c290fa1c4b7b280a26cbf742ab109fa2db2d10a3 (patch) | |
| tree | 99479d2fc8a495558245c1d2443ee86bd24f840e /tools/examples | |
| parent | 2bdc928237ca74c5194d9487c21290eb8f1016c3 (diff) | |
| download | xen-c290fa1c4b7b280a26cbf742ab109fa2db2d10a3.tar.gz xen-c290fa1c4b7b280a26cbf742ab109fa2db2d10a3.tar.bz2 xen-c290fa1c4b7b280a26cbf742ab109fa2db2d10a3.zip | |
tools/xend: Fix performance of xend with more than 10000 FC device paths
On server startup xend start or a later xend restart needs approx. 30 min to
start/restart. Without attached FC devices xend start/restart needs only some
seconds.
server type: Fujitsu Primergy RX600-S5
The time gets lost in xen/xend/XendNode.py line 329 while calling
vscsi_util.get_all_scsi_device().
329 for pscsi_record in vscsi_util.get_all_scsi_devices():
330 scsi_id = pscsi_record['scsi_id']
331 if scsi_id:
332 saved_HBA_uuid = None
I think, in most cases we don't need all the PSCSI devices registered in
xend, but only a few of it.
So a good solution for this perforamce issue is to scan only the SCSI device
paths we need, controlled by a new option in xend-config.sxp.
I have made a patch to allow specification of scsi devices we need in xend
in the config file xend-config.sxp.
The new options pscsi-device-mask expects a list of device ids oder partial
device ids like the option of lsscsi, e.g.
(pscsi-device-mask ('<partial-dev-id1' 'partial-dev-id2' ...))
Without this option set in xend-config.sxp or if lsscsi is not support, all
device paths are process like today.
Signed-off-by: Lutz Dube Lutz.Dube@ts.fujitsu.com
Comment from Masaki Kanno <kanno.masaki@jp.fujitsu.com>: "Well done"
Committed-by: Ian Jackson <ian.jackson@eu.citrix.com>
Diffstat (limited to 'tools/examples')
| -rw-r--r-- | tools/examples/xend-config.sxp | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/tools/examples/xend-config.sxp b/tools/examples/xend-config.sxp index b7e98f464d..0896a27645 100644 --- a/tools/examples/xend-config.sxp +++ b/tools/examples/xend-config.sxp @@ -294,3 +294,11 @@ # we have to realize this may incur security issue and we can't make sure the # device assignment could really work properly even after we do this. #(pci-passthrough-strict-check yes) + +# If we have a very big scsi device configuration, start of xend is slow, +# because xend scans all the device paths to build its internal PSCSI device +# list. If we need only a few devices for assigning to a guest, we can reduce +# the scan to this device. Set list list of device paths in same syntax like in +# command lsscsi, e.g. ('16:0:0:0' '15:0') +# (pscsi-device-mask ('*')) + |