Computers & Hardware > PC Hardware
New vulnerability in Intel processors
broadstairs:
A new issue has arisen with Intel processors, not present in AMD though. See https://www.theregister.co.uk/2018/08/14/intel_l1_terminal_fault_bugs/ here for one description. This could be as bad as Meltdown etc.....
Stuart
Peguero:
Do you think we can expect another drop in performance after they fix this? That would suck.
Weaver:
Not much detail in the stuff I read but I suspect that they have been able to improve things without crucifying performance. Disabling hyper threading in one case will knock out what 5-15% performance in some cases but I do not like hyper threading much as I suspect there are even cases where unfortunate software can end up going slower with hyper threading on than off and it is better to turn it off.
ejs:
Linux 4.18.1, my cpu bug list is getting quite long:
--- Code: ---$ cat /proc/cpuinfo
model name : Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
bugs : cpu_meltdown spectre_v1 spectre_v2 spec_store_bypass l1tf
--- End code ---
burakkucat:
Here's a simple shell script that might be useful --
--- Code: ---#!/bin/sh
/bin/echo -e "Kernel -- \c"
/bin/uname -r
if [ -d /sys/devices/system/cpu/vulnerabilities ]; then
if [ -r /sys/devices/system/cpu/vulnerabilities/l1tf ]; then
/bin/echo -e "L1tf -- \c"
/bin/cat /sys/devices/system/cpu/vulnerabilities/l1tf
fi
if [ -r /sys/devices/system/cpu/vulnerabilities/meltdown ]; then
/bin/echo -e "Meltdown -- \c"
/bin/cat /sys/devices/system/cpu/vulnerabilities/meltdown
fi
if [ -r /sys/devices/system/cpu/vulnerabilities/spec_store_bypass ]; then
/bin/echo -e "Speculative Store Bypass -- \c"
/bin/cat /sys/devices/system/cpu/vulnerabilities/spec_store_bypass
fi
if [ -r /sys/devices/system/cpu/vulnerabilities/spectre_v1 ]; then
/bin/echo -e "Spectre v1 -- \c"
/bin/cat /sys/devices/system/cpu/vulnerabilities/spectre_v1
fi
if [ -r /sys/devices/system/cpu/vulnerabilities/spectre_v2 ]; then
/bin/echo -e "Spectre v2 -- \c"
/bin/cat /sys/devices/system/cpu/vulnerabilities/spectre_v2
fi
else
/bin/echo " -- No data available."
fi
exit 0
--- End code ---
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