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authorDamien Le Moal <damien.lemoal@wdc.com>2019-07-31 13:32:07 +0900
committerJens Axboe <axboe@kernel.dk>2019-07-31 08:47:59 -0600
commitcc5e4cb0b61e78f176754cec57d62c7d53d70fc6 (patch)
treeb208eedeb1c691e700a43a4160b8bc577c8e23b1 /helpers.c
parent029b42ace698eae477c5e261d2f82b191507526b (diff)
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bssplit: Fix handling of 0 percentage
If a block size percentage is ispecified as 0 in bssplit, the block size defined is not ignored by the loop in get_next_buflen(). In particular, if the first (smallest) block size specified has a 0 percentage, the loop is existed and that block size used as the next IO size, resulting in a behavior equivalent to specifying 100%. E.g. using --bssplit=64k/0,1024k/100 results in 100% of issued IOs to be 64KB instead of 1MB. Fix this by ignoring bssplit entries that have a 0 percentage. This is safe as the initialization of the bssplit array ensure that the sum of all percentages is always 100, guaranteeing that a block size will be chosen for the next IO size. Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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