Messages in this thread | | | Date | Fri, 10 Apr 2020 12:14:06 +0200 | From | David Sterba <> | Subject | Re: [LKP] [btrfs] 8d47a0d8f7: fio.write_bw_MBps -28.6% regression |
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On Fri, Apr 10, 2020 at 02:44:55PM +0800, Qu Wenruo wrote: > On 2020/4/10 下午2:34, Xing Zhengjun wrote: > > Hi Wenruo, > > > > We test it in v5.6, the issue still exist, do you have time to take a > > look at this? Thanks. > > This is expected. > > The extra check brings new overhead mostly equal to another CRC32 run. > > We believe it's worthy, as our read time tree checker has exposed quite > some bit flip corruption.
The test probably runs on a PMEM device so there's no slowdown from the actual IO and the in-memory checks are measurable, though 28% is a lot, I'd expect something like 5-10% at most.
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