--- Day changed

--- Log opened Wed Apr 20 23:59:02 2005
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14:26 < visik7> hi
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17:20 < visik7> hi
17:20 < visik7> is there a kind of Cow-File in XEN ?
17:21 < jonmason> not sure what a cow file is
17:21 < visik7> Copy-on-Write
17:21 < visik7> multiple domU with a unique root-fs in read only and many cow-file for write operation
17:21 < visik7> s
17:22 < visik7> in uml there is this mechanism
17:23 < rharper> 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. 
17:23 < rharper> ack, visik7 ^^
17:23 < visik7> understood
17:58 < riel> HYPERVISOR_mmuext_op failed!
17:58 < riel> op.cmd = MMUEXT_TLB_FLUSH_MULTI, op.cpuset = 0
17:58 < riel> neat
17:59 < riel> we called mmuext_op with a zero cpuset
18:00 < eigood> I heard of a generic COW driver on the uml mailing list recently
18:14 < knewt> anyone got suggestions of good ways to stress test a block device driver?
18:14 < visik7> knewt: bonnie ?
18:15 < knewt> will that do multiple overlapping reads and writes of the same sectors?
18:18 < caker> visik7: http://www.atconsultancy.nl/cowloop/
18:19 < caker> loop/file based, so you won't get the full performance that a true block device would give you under Xen
18:19  * knewt is working on a COW devicemapper target as it happens *g*
18:19  * caker drools
18:20 < visik7> ok no problem 
18:20 < knewt> 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
18:22 < knewt> once i've got the basic functionality working, i'm also going to add background cowifying support
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18:30 -!- 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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23:56 < drbyte> 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 
23:58 < riel> neat
23:58 < riel> say hi to rjc for me ;)
--- Log closed Thu Apr 21 23:59:01 2005