lkml.org 
[lkml]   [2018]   [Aug]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] Performance Improvement in CRC16 Calculations.
    On Fri, 10 Aug 2018, Joe Perches wrote:

    > On Fri, 2018-08-10 at 14:12 -0500, Jeff Lien wrote:
    > > This patch provides a performance improvement for the CRC16 calculations done in read/write
    > > workloads using the T10 Type 1/2/3 guard field. For example, today with sequential write
    > > workloads (one thread/CPU of IO) we consume 100% of the CPU because of the CRC16 computation
    > > bottleneck. Today's block devices are considerably faster, but the CRC16 calculation prevents
    > > folks from utilizing the throughput of such devices. To speed up this calculation and expose
    > > the block device throughput, we slice the old single byte for loop into a 16 byte for loop,
    > > with a larger CRC table to match. The result has shown 5x performance improvements on various
    > > big endian and little endian systems running the 4.18.0 kernel version.
    >
    > Thanks.
    >
    > This seems a sensible tradeoff for the 4k text size increase.

    More like 7.5KB. Would be best if this was configurable so the small
    version remained available.


    Nicolas

    \
     
     \ /
      Last update: 2018-08-10 22:03    [W:5.636 / U:0.044 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site