From mboxrd@z Thu Jan  1 00:00:00 1970
From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Subject: Re: 2.6.31.6 pv_ops from xen-4.0.0-rc1 hangs by DomU
	initrd
Date: Tue, 26 Jan 2010 15:00:36 -0500
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> > Also, how did you generate the initrd?
> > 
> echo ""
>   mecho -info "Create initrd ..."
>   echo ""
> 
>   cd ${INITRD_DIR}
>   find ./ | cpio -H newc -o > ${INSTALL_PATH}/boot/initrd-${KERNEL_VERSION}
>   cpio=$?
> 
>   if [ ${cpio} == 0 ]
>   then
>     gzip -f ${INSTALL_PATH}/boot/initrd-${KERNEL_VERSION}

I think you need to append "-9" argument. That is what 'mkinitrd' does:

(cd $MNTIMAGE; findall . | cpio -H newc --quiet -o) >| $IMAGE || exit 1

if [ -n "$compress" ]; then
    gzip -9 < $IMAGE >| $target || rc=1
else
    cp -a $IMAGE $target || rc=1
fi