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srpt/README: Recommend to disable CONFIG_SCHED_DEBUG and CONFIG_SCHEDSTATS

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4507 d57e44dd-8a1f-0410-8b47-8ef2f437770f
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Bart Van Assche
2012-09-07 12:20:05 +00:00
parent 00e1e72718
commit ab28f2aaa3
1 changed files with 16 additions and 13 deletions
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@@ -321,20 +321,23 @@ For more information, see also:
Performance Notes - Target Side
-------------------------------
When using high-latency storage devices (hard disks), the default value
choosen by SCST for DEVICE.threads_num should be fine. When using low-latency
storage devices though (SSDs), DEVICE.threads_num should be set to 1 or 2 in
/etc/scst.conf in order to reach optimal performance for small block sizes
(e.g. 4 KB).
* When using high-latency storage devices (hard disks), the default value
choosen by SCST for DEVICE.threads_num should be fine. When using
low-latency storage devices though (SSDs), DEVICE.threads_num should be set
to 1 or 2 in /etc/scst.conf in order to reach optimal performance for small
block sizes (e.g. 4 KB).
When multiple InfiniBand HCA's are present in a target system the Linux
kernel by default will assign the associated interrupt handlers to CPU 0.
Even irqbalance will often assign the interrupt handlers of multiple HCA's
to the same CPU. That is unfortunate because it leads to unfair handling of
SRP sessions. The solution is to assign InfiniBand HCA interrupts manually
to different CPU's. That's possible by writing looking up the InfiniBand
interrupt numbers in /proc/interrupts and by writing proper bitmasks into
/proc/irq/<n>/smp_affinity.
* When multiple InfiniBand HCA's are present in a target system the Linux
kernel by default will assign the associated interrupt handlers to CPU 0.
Even irqbalance will often assign the interrupt handlers of multiple HCA's
to the same CPU. That is unfortunate because it leads to unfair handling of
SRP sessions. The solution is to assign InfiniBand HCA interrupts manually
to different CPU's. That's possible by writing looking up the InfiniBand
interrupt numbers in /proc/interrupts and by writing proper bitmasks into
/proc/irq/<n>/smp_affinity.
* Disabling CONFIG_SCHED_DEBUG and CONFIG_SCHEDSTATS in the kernel config
helps.
Performance Notes - Initiator Side