Displaying 3 results from an estimated 3 matches for "retp_enabled".
2020 Jun 18
0
very low performance of Xen guests
...se.
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I finally managed to install a fresh KVM host / guest pair on an
identical blade ( HS21XM, 64 GB ram, 2*E5450@ 3.00GHz ). Here are the
results I see:
1. KVM host, stock instalation and fully updated, kernel 3.10.0-1127.10.1
#cd /sys/kernel/debug/x86/
#cat ibrs_enabled pti_enabled retp_enabled
0
1
1
#time yum -y reinstall kernel-3.10.0-1127.el7.x86_64
real??? 0m50.026s
user??? 0m32.872s
sys???? 0m23.312s
2. KVM guest on the same machine (virt-install --name guest1-rhel7
--memory 2048 --vcpus 2? --disk size=20 --network=bridge:br0 --pxe
--os-variant rhel7 <=== copy/paste from
htt...
2020 Jun 14
4
very low performance of Xen guests
Hello
??? For the past months I've been testing upgrading my Xen hosts to
CentOS 7 and I face an issue for which I need your help to solve.
??? The testing machines are IBM blades, model H21 and H21XM. Initial
tests were performed on the H21 with 16 GB RAM; during the last 6=7
weeks I've been using the H21XM with 64 GB. In all cases the guests were
fully updated CentOS 7 --
2018 Mar 15
0
Good work, Red Hat!
...sembler indirect jumps (Waiman Long) [1543022 1535645]
- [x86] spec_ctrl: Upgrade GCC retpoline warning to an error for brew builds (Waiman Long) [1543022 1535645]
- [x86] retpoline: Don't use kernel indirect thunks in vsyscalls (Waiman Long) [1543022 1535645]
- [x86] spec_ctrl: Add a read-only retp_enabled debugfs knob (Waiman Long) [1543022 1535645]
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