sys-block/btrace
btrace can show detailed info about what is happening on a block device io queue.
Screenshots
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btrace-1.0.3~amd64 ~ppc ~x86doc
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Download License: GPL-2
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btrace-1.0.1-r1amd64 ppc x86docView Download License: GPL-2
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btrace-1.0.1~amd64 ~ppc ~x86docView Download License: GPL-2
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btrace-1.0.0~amd64 ~ppc ~x86docView Download License: GPL-2
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btrace-0.0.20071210202527amd64 ppc x86docView Download License: GPL-2