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#xen IRC Logs for 2005-04-21

---Logopened Thu Apr 21 00:00:37 2005
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13:26visik7 hi
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16:20visik7 hi
16:20visik7 is there a kind of Cow-File in XEN ?
16:21jonmason not sure what a cow file is
16:21visik7 Copy-on-Write
16:21visik7 multiple domU with a unique root-fs in read only and many cow-file for write operation
16:21visik7 s
16:22visik7 in uml there is this mechanism
16:23rharper ville-: xen does not provide one in the 2.x, 3.x versions, I believe back in xen 1.x they implemented one based on lvm but didnt bring that forward because regular linux lvm was sufficient.
16:23rharper ack, visik7 ^^
16:23visik7 understood
16:58riel HYPERVISOR_mmuext_op failed!
16:58riel op.cmd = MMUEXT_TLB_FLUSH_MULTI, op.cpuset = 0
16:58riel neat
16:59riel we called mmuext_op with a zero cpuset
17:00eigood I heard of a generic COW driver on the uml mailing list recently
17:14knewt anyone got suggestions of good ways to stress test a block device driver?
17:14visik7 knewt: bonnie ?
17:15knewt will that do multiple overlapping reads and writes of the same sectors?
17:18caker visik7: http://www.atconsultancy.nl/cowloop/
17:19caker loop/file based, so you won't get the full performance that a true block device would give you under Xen
17:19* knewt is working on a COW devicemapper target as it happens *g*
17:19* caker drools
17:20visik7 ok no problem
17:20knewt the simple stuff is done. it'll read the bitmap, read sectors from the backing device or the cow device as appropriate, and write to the cow device if the sector has already been cowified. it's the complex cowifying step still to do
17:22knewt once i've got the basic functionality working, i'm also going to add background cowifying support
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17:30--- Channel: services.oftc.net changed the topic of #xen to: Xen Homepage-> http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html || Xen Wiki -> http://wiki.xensource.com || vm-tools : http://www.cs.utexas.edu/users/aliguori/vm-tools/
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17:40--- User: *** riel is now known as unriel
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20:37--- User: *** surriel is now known as riel
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22:56drbyte riel: btw, i've got rjc sitting next to me now, and i've convinced him to try fiddling with xen more, and make sure selinux plays well with it
22:58@riel neat
22:58@riel say hi to rjc for me ;)
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23:00drbyte riel: will do; we're listening to a talk now
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---Logclosed Fri Apr 22 00:00:13 2005