Messages in this thread | | | Date | Fri, 12 Jun 2020 11:19:23 -0400 (EDT) | From | Nicolas Pitre <> | Subject | Re: [RFC 0/3] ARM: copy_{from,to}_user() for vmsplit 4g/4g |
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On Fri, 12 Jun 2020, afzal mohammed wrote:
> Performance wise, results are not encouraging, 'dd' on tmpfs results, > > ARM Cortex-A8, BeagleBone White (256MiB RAM): > w/o series - ~29.5 MB/s > w/ series - ~20.5 MB/s > w/ series & highmem disabled - ~21.2 MB/s > > On Cortex-A15(2GiB RAM) in QEMU: > w/o series - ~4 MB/s > w/ series - ~2.6 MB/s > > Roughly a one-third drop in performance. Disabling highmem improves > performance only slightly.
Could you compare with CONFIG_UACCESS_WITH_MEMCPY as well?
Nicolas
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