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Re: [Xen-devel] [PATCH] xen: increase static dmesg buffer to 64K
| To: | Jan Beulich <JBeulich@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] [PATCH] xen: increase static dmesg buffer to 64K |
| From: | Olaf Hering <olaf@xxxxxxxxx> |
| Date: | Mon, 18 Jul 2011 10:16:28 +0200 |
| Cc: | xen-devel@xxxxxxxxxxxxxxxxxxx |
| Delivery-date: | Mon, 18 Jul 2011 01:17:36 -0700 |
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| User-agent: | Mutt/1.5.21.rev5535 (2011-07-01) |
On Mon, Jul 18, Jan Beulich wrote: > >>> On 17.07.11 at 17:43, Olaf Hering <olaf@xxxxxxxxx> wrote: > > # HG changeset patch > > # User Olaf Hering <olaf@xxxxxxxxx> > > # Date 1310917380 -7200 > > # Node ID c6cade90d47f32e19f529930ba9f9acfa69f065f > > # Parent 31dd84463eece20bd01c7aee22b52a0c06c67545 > > xen: increase static dmesg buffer to 64K > > > > On large systems the static dmesg buffer will overflow the 16K buffer, early > > messages are lost. Increase the size to 64K to capture all lines on systems > > without serial console. > > Please don't - on small systems it's a waste, and on even larger > systems it still won't help. If anything, the dynamic allocation may > need to happen earlier. As you probably saw, console_init_postirq() > already sizes the buffer dependent on the number of CPUs in the > system. I think conring_size= should be evaluated very early. Is there a way to allocate a range of mfns very early which can then be used for the dmesg buffer? Olaf _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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