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Date: Wed, 30 Mar 2016 17:34:19 +0900 From: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> To: Minchan Kim <minchan@...nel.org> Cc: Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>, Sergey Senozhatsky <sergey.senozhatsky@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: zram: per-cpu compression streams Hello Minchan, sorry for long reply. On (03/28/16 12:21), Minchan Kim wrote: [..] > group_reporting > buffer_compress_percentage=50 > filename=/dev/zram0 > loops=10 I used a bit different script. no `buffer_compress_percentage' option, because it provide "a mix of random data and zeroes" buffer_compress_percentage=int If this is set, then fio will attempt to provide IO buffer content (on WRITEs) that compress to the specified level. Fio does this by providing a mix of random data and zeroes and I also used scramble_buffers=0. but default scramble_buffers is true, so scramble_buffers=bool If refill_buffers is too costly and the target is using data deduplication, then setting this option will slightly modify the IO buffer contents to defeat normal de-dupe attempts. This is not enough to defeat more clever block compression attempts, but it will stop naive dedupe of blocks. Default: true. hm, but I guess it's not enough; fio probably will have different data (well, only if we didn't ask it to zero-fill the buffers) for different tests, causing different zram->zsmalloc behaviour. need to check it. > Hmm, Could you retest to who how the benefit is big? sure. the results are: - seq-read - rand-read - seq-write - rand-write (READ + WRITE) - mixed-seq - mixed-rand (READ + WRITE) TEST 4 streams 8 streams per-cpu #jobs1 READ: 2665.4MB/s 2515.2MB/s 2632.4MB/s READ: 2258.2MB/s 2055.2MB/s 2166.2MB/s WRITE: 933180KB/s 894260KB/s 898234KB/s WRITE: 765576KB/s 728154KB/s 746396KB/s READ: 563169KB/s 541004KB/s 551541KB/s WRITE: 562660KB/s 540515KB/s 551043KB/s READ: 493656KB/s 477990KB/s 488041KB/s WRITE: 493210KB/s 477558KB/s 487600KB/s #jobs2 READ: 5116.7MB/s 4607.1MB/s 4401.5MB/s READ: 4401.5MB/s 3993.6MB/s 3831.6MB/s WRITE: 1539.9MB/s 1425.5MB/s 1600.0MB/s WRITE: 1311.1MB/s 1228.7MB/s 1380.6MB/s READ: 1001.8MB/s 960799KB/s 989.63MB/s WRITE: 998.31MB/s 957540KB/s 986.26MB/s READ: 921439KB/s 860387KB/s 899720KB/s WRITE: 918314KB/s 857469KB/s 896668KB/s #jobs3 READ: 6670.9MB/s 6469.9MB/s 6548.8MB/s READ: 5743.4MB/s 5507.8MB/s 5608.4MB/s WRITE: 1923.8MB/s 1885.9MB/s 2191.9MB/s WRITE: 1622.4MB/s 1605.4MB/s 1842.2MB/s READ: 1277.3MB/s 1295.8MB/s 1395.2MB/s WRITE: 1276.9MB/s 1295.4MB/s 1394.7MB/s READ: 1152.6MB/s 1137.1MB/s 1216.6MB/s WRITE: 1152.2MB/s 1137.6MB/s 1216.2MB/s #jobs4 READ: 8720.4MB/s 7301.7MB/s 7896.2MB/s READ: 7510.3MB/s 6690.1MB/s 6456.2MB/s WRITE: 2211.6MB/s 1930.8MB/s 2713.9MB/s WRITE: 2002.2MB/s 1629.8MB/s 2227.7MB/s READ: 1657.8MB/s 1437.1MB/s 1765.8MB/s WRITE: 1651.7MB/s 1432.7MB/s 1759.3MB/s READ: 1467.7MB/s 1201.7MB/s 1523.5MB/s WRITE: 1462.3MB/s 1197.3MB/s 1517.9MB/s #jobs5 READ: 7791.9MB/s 6852.7MB/s 7487.9MB/s READ: 6214.6MB/s 6449.6MB/s 7106.5MB/s WRITE: 2017.9MB/s 1978.1MB/s 2221.5MB/s WRITE: 1913.1MB/s 1664.9MB/s 1985.8MB/s READ: 1417.6MB/s 1447.7MB/s 1558.8MB/s WRITE: 1419.8MB/s 1449.3MB/s 1561.2MB/s READ: 1336.9MB/s 1234.1MB/s 1404.7MB/s WRITE: 1338.2MB/s 1236.9MB/s 1406.8MB/s #jobs6 READ: 8680.9MB/s 8500.0MB/s 7116.3MB/s READ: 7329.4MB/s 6580.7MB/s 6476.2MB/s WRITE: 2121.4MB/s 1918.6MB/s 2472.8MB/s WRITE: 1936.8MB/s 1826.9MB/s 2106.8MB/s READ: 1559.9MB/s 1506.3MB/s 1643.6MB/s WRITE: 1554.7MB/s 1501.2MB/s 1637.2MB/s READ: 1459.7MB/s 1258.9MB/s 1502.6MB/s WRITE: 1454.8MB/s 1254.6MB/s 1497.5MB/s #jobs7 READ: 9170.0MB/s 7905.2MB/s 8043.9MB/s READ: 6412.7MB/s 6792.7MB/s 6457.8MB/s WRITE: 2042.4MB/s 1972.5MB/s 2400.6MB/s WRITE: 1938.8MB/s 1808.7MB/s 2152.6MB/s READ: 1634.9MB/s 1505.8MB/s 1746.4MB/s WRITE: 1640.1MB/s 1511.4MB/s 1753.7MB/s READ: 1407.9MB/s 1239.1MB/s 1480.8MB/s WRITE: 1413.8MB/s 1245.2MB/s 1486.1MB/s #jobs8 READ: 8563.4MB/s 8106.7MB/s 7696.3MB/s READ: 6909.1MB/s 5790.5MB/s 6537.7MB/s WRITE: 2040.3MB/s 2061.2MB/s 2481.7MB/s WRITE: 1993.5MB/s 1859.4MB/s 2171.5MB/s READ: 1691.6MB/s 1585.8MB/s 1749.9MB/s WRITE: 1686.3MB/s 1580.1MB/s 1744.5MB/s READ: 1478.3MB/s 1365.4MB/s 1529.2MB/s WRITE: 1473.5MB/s 1361.2MB/s 1525.3MB/s #jobs9 READ: 9272.8MB/s 11769MB/s 8052.7MB/s READ: 6954.6MB/s 6375.0MB/s 7116.3MB/s WRITE: 2170.3MB/s 1961.6MB/s 2487.9MB/s WRITE: 1865.9MB/s 1974.2MB/s 2233.6MB/s READ: 1663.9MB/s 1561.1MB/s 1719.1MB/s WRITE: 1662.3MB/s 1560.6MB/s 1718.4MB/s READ: 1515.6MB/s 1379.2MB/s 1546.2MB/s WRITE: 1514.2MB/s 1377.8MB/s 1544.8MB/s #jobs10 READ: 8737.3MB/s 7950.4MB/s 7915.5MB/s READ: 6884.9MB/s 6332.8MB/s 6334.3MB/s WRITE: 2077.9MB/s 2005.4MB/s 2509.5MB/s WRITE: 1893.3MB/s 1935.9MB/s 2155.4MB/s READ: 1519.2MB/s 1548.1MB/s 1622.9MB/s WRITE: 1519.5MB/s 1549.2MB/s 1623.2MB/s READ: 1383.4MB/s 1385.2MB/s 1437.6MB/s WRITE: 1383.6MB/s 1385.4MB/s 1437.8MB/s -ss
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