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Comment 2RHEL Program Management
2013-03-04 06:47:20 UTC
This request was not resolved in time for the current release.
Red Hat invites you to ask your support representative to
propose this request, if still desired, for consideration in
the next release of Red Hat Enterprise Linux.
The enabling of ioeventfd on 6.6 and 6.5.z makes a huge difference. Testing the sequential read can tell this:
RHEL 6.4
==============================================================
bs iodepth jobs bw iops latency
--------------------------------------------------------------
4k 64 1 151 38872 1626
RHEL 6.5
==============================================================
bs iodepth jobs bw iops latency
--------------------------------------------------------------
4k 64 1 517 132413 478
RHEL 6.6
==============================================================
bs iodepth jobs bw iops latency
--------------------------------------------------------------
4k 64 1 491 125940 503
RHEL 6.6 - but disable ioeventfd
==============================================================
bs iodepth jobs bw iops latency
--------------------------------------------------------------
4k 64 1 123 31641 2005
So I think this BZ can be closed. Xiaomei, could you confirm?