From: Alex Williamson <alex.williamson@hp.com>
To: kvm-devel <kvm@vger.kernel.org>
Subject: Can't boot guest with more than 3585MB when using large pages
Date: Tue, 24 Mar 2009 15:06:46 -0600 [thread overview]
Message-ID: <1237928806.6124.39.camel@bling> (raw)
On a 2.6.29, x86_64 host/guest, what's special about specifying a guest
size of -m 3586 when using -mem-path backed by hugetlbfs? 3585 works,
3586 hangs here:
...
PCI-DMA: Using software bounce buffering for IO (SWIOTLB)
Placing 64MB software IO TLB between ffff880020000000 - ffff880024000000
software IO TLB at phys 0x20000000 - 0x24000000
Memory: 3504832k/4196352k available (2926k kernel code, 524740k absent, 166780k reserved, 1260k data, 496k init)
I can back -mem-path by tmpfs or disk and it works fine. Also works
with no -mem-path, but it would obviously be nice to benefit from large
pages on big guests. The system has plenty of huge pages to back the
request, and booting with -mem-prealloc makes no difference. Tested on
latest git as of today. Thanks,
Alex
next reply other threads:[~2009-03-24 21:06 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-24 21:06 Alex Williamson [this message]
2009-03-24 21:57 ` Can't boot guest with more than 3585MB when using large pages Ryan Harper
2009-03-25 16:10 ` Marcelo Tosatti
2009-03-25 16:26 ` Alex Williamson
2009-04-03 23:28 ` Marcelo Tosatti
2009-04-04 17:56 ` Alex Williamson
2009-04-05 11:53 ` Avi Kivity
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