Michael Brade
2010-Aug-01 19:27 UTC
[Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
Hi,
I have compiled Xen and Jeremy''s linux-2.6-pvops.git kernel, branch
"xen/stable-2.6.33.x". This branch uses the wrong gntdev name though,
Xen
says:
xen be core: xen be core: can''t open gnttab device
With the following patch Xen works:
diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c
index ddc59cc..1bd01d4 100644
--- a/drivers/xen/gntdev.c
+++ b/drivers/xen/gntdev.c
@@ -594,7 +594,7 @@ static const struct file_operations gntdev_fops = {
static struct miscdevice gntdev_miscdev = {
.minor = MISC_DYNAMIC_MINOR,
- .name = "gntdev",
+ .name = "xen/gntdev",
.fops = &gntdev_fops,
};
regards,
Michael
PS: I am not on this list, so in case you have any comments please CC me.
--
Michael Brade; KDE Developer
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''s/e/\@/2;s/$/.org/;s/bra/k/2''
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KDE 4: Beyond Your Expectations
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Pasi Kärkkäinen
2010-Aug-02 13:41 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On Sun, Aug 01, 2010 at 09:27:09PM +0200, Michael Brade wrote:> Hi, > > I have compiled Xen and Jeremy''s linux-2.6-pvops.git kernel, branch > "xen/stable-2.6.33.x". This branch uses the wrong gntdev name though, Xen > says: >I''m not sure if xen/stable-2.6.33.x has all the patches.. xen/stable-2.6.32.x is what most people use.. -- Pasi> xen be core: xen be core: can''t open gnttab device > > With the following patch Xen works: > > diff --git a/drivers/xen/gntdev.c b/drivers/xen/gntdev.c > index ddc59cc..1bd01d4 100644 > --- a/drivers/xen/gntdev.c > +++ b/drivers/xen/gntdev.c > @@ -594,7 +594,7 @@ static const struct file_operations gntdev_fops = { > > static struct miscdevice gntdev_miscdev = { > .minor = MISC_DYNAMIC_MINOR, > - .name = "gntdev", > + .name = "xen/gntdev", > .fops = &gntdev_fops, > }; > > > regards, > Michael > > PS: I am not on this list, so in case you have any comments please CC me. > > -- > Michael Brade; KDE Developer > |-mail: echo brade !#|tr -d "c oh"|s\e\d ''s/e/\@/2;s/$/.org/;s/bra/k/2'' > °--web: http://www.behindkde.org/people/michaelb/ > > KDE 4: Beyond Your Expectations> _______________________________________________ > Xen-devel mailing list > Xen-devel@lists.xensource.com > http://lists.xensource.com/xen-devel_______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jeremy Fitzhardinge
2010-Aug-02 15:26 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On 08/01/2010 12:27 PM, Michael Brade wrote:> Hi, > > I have compiled Xen and Jeremy''s linux-2.6-pvops.git kernel, branch > "xen/stable-2.6.33.x". This branch uses the wrong gntdev name though, Xen > says:Sorry, .33.x is very "stable" in the sense that I haven''t really been updating it. As Pasi says, 32.x is where the action is at the moment. Once .35 comes out, I plan to make that the new base for development (though .32 will be maintained for the long term). J _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Michael Brade
2010-Aug-04 17:30 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On Monday 02 August 2010 17:26:30 you wrote:> On 08/01/2010 12:27 PM, Michael Brade wrote: > > Hi, > > > > I have compiled Xen and Jeremy''s linux-2.6-pvops.git kernel, branch > > "xen/stable-2.6.33.x". This branch uses the wrong gntdev name though, Xen > > > says: > Sorry, .33.x is very "stable" in the sense that I haven''t really been > updating it. As Pasi says, 32.x is where the action is at the moment. > Once .35 comes out, I plan to make that the new base for development > (though .32 will be maintained for the long term). > > JOk, cool, then I''ll switch back to .32. Thanks for the info! And hey, you know, .35 is out already ;-) I''m really looking forward to that because of the XFS improvements. cheers, Michael -- Michael Brade; KDE Developer |-mail: echo brade !#|tr -d "c oh"|s\e\d ''s/e/\@/2;s/$/.org/;s/bra/k/2'' °--web: http://www.behindkde.org/people/michaelb/ KDE 4: Beyond Your Expectations _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jeremy Fitzhardinge
2010-Aug-04 17:54 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On 08/04/2010 10:30 AM, Michael Brade wrote:> Ok, cool, then I''ll switch back to .32. Thanks for the info! And hey, you > know, .35 is out already ;-) I''m really looking forward to that because of the > XFS improvements.Ah, you use xfs from within a domain? Does that work OK? J _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Michael Brade
2010-Aug-04 18:43 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On Wednesday 04 August 2010 19:54:53 Jeremy Fitzhardinge wrote:> On 08/04/2010 10:30 AM, Michael Brade wrote: > > Ok, cool, then I''ll switch back to .32. Thanks for the info! And hey, you > > know, .35 is out already ;-) I''m really looking forward to that because > > of the XFS improvements. > > Ah, you use xfs from within a domain? Does that work OK?In Dom0, absolutely! I even have a root file system on NFS with XFS using PXE in Dom0 and that is running without any problems so far. Just a little slow for my taste when many small files need to be processed. Say, for instance, you read a tar.gz file from the Dom0-NFS share, unpack it, and write the result directly back to that NFS share. That takes a lot longer than it would take locally, even with a Gigabit-LAN. But I hope that changes a little with 2.6.35 and the delayed logging. The Windows-DomU (hvm-stubdom) uses a file as its harddisk on XFS and also seems to work fine (though I am not really using it much, I have it just because it''s possible :) The other DomUs I am currently setting up, so I can''t say much about that yet. There will be a mail server and a web server running on two of those domains, both of them using xfs. Should there be any issues I''ll let you know. XFS has been my filesystem of choice for at least 5 years I think. Never had any issues with it. Before I used reiserfs and before that I had ext2/3 but that one gave me too many problems so I never tried it again. Would you recommend anything else instead? cheers, -- Michael Brade; KDE Developer |-mail: echo brade !#|tr -d "c oh"|s\e\d ''s/e/\@/2;s/$/.org/;s/bra/k/2'' °--web: http://www.behindkde.org/people/michaelb/ KDE 4: Beyond Your Expectations _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel
Jeremy Fitzhardinge
2010-Aug-04 19:21 UTC
Re: [Xen-devel] PATCH: Jeremy''s linux 2.6.33-pvops: wrong gntdev
On 08/04/2010 11:43 AM, Michael Brade wrote:> XFS has been my filesystem of choice for at least 5 years I think. Never had > any issues with it. Before I used reiserfs and before that I had ext2/3 but > that one gave me too many problems so I never tried it again. > > Would you recommend anything else instead?I ask because xfs does some memory mapping tricks which are actually fairly awkward to handle in a PV Xen domain. We end up disabling its lazy vunmap behaviour, which means there''s a bit more overhead from tlb flushes and the like. I don''t know what kind of performance effect that actually has, or in what circumstances. J _______________________________________________ Xen-devel mailing list Xen-devel@lists.xensource.com http://lists.xensource.com/xen-devel