RAS/CEC: Reduce offline page threshold for Intel systems

A large scale study of memory errors on Intel systems in data centers showed that aggressively taking pages with corrected errors offline is the best strategy of using corrected errors as a predictor of future uncorrected errors. Set the threshold to "2" on Intel systems. AMD guidance is that this is not necessary for their systems. Signed-off-by: Tony Luck <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Yazen Ghannam <[email protected]> Link: https://lore.kernel.org/r/[email protected] Link: https://lore.kernel.org/r/YulOZ/[email protected]
kawasaki · Aug 22, 2022 · d25c694 · d25c694
1 parent 1c23f9e
commit d25c694
Showing 1 changed file with 8 additions and 0 deletions.
diff --git a/drivers/ras/cec.c b/drivers/ras/cec.c
@@ -556,6 +556,14 @@ static int __init cec_init(void)
 	if (ce_arr.disabled)
 		return -ENODEV;
 
+	/*
+	 * Intel systems may avoid uncorrectable errors
+	 * if pages with corrected errors are aggressively
+	 * taken offline.
+	 */
+	if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
+		action_threshold = 2;
+
 	ce_arr.array = (void *)get_zeroed_page(GFP_KERNEL);
 	if (!ce_arr.array) {
 		pr_err("Error allocating CE array page!\n");