#6 tcp_low_latency

open
nobody
5
2004-05-21
2004-05-21
Meltifa
No

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

Discussion

  • Surekha P.C
    Surekha P.C
    2004-05-24

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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?