#6 tcp_low_latency

[Meltifa]

Please make the tcp_low_latency option enabled when
restarting the iscsi daemon or persistant when installing
the iscsi driver. We find that the linux kernel drops
frames in the tcp stack when it is disabled. With high I/O
iscsi environments having this option disabled causes
re-transmissions and hurts overall performance

[Surekha P.C]

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Setting "tcp_low_latency" as enabled by default could have
an effect on I/O throughput as mentioned in the kernel
documentation(Documentation/networking/ips-sysctl.txt).

Since iSCSI driver is an I/O (SCSI I/O) driver, we would want
it "off". It would be useful if we get data on I/O throughputs
by putting it "off" and "on". Can you share your findings on
this?