linux-kernel - Re: [PATCH 1/2] zram: free meta out of init

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Date:	Wed, 28 Jan 2015 15:08:25 +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>,
	Jerome Marchand <jmarchan@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Nitin Gupta <ngupta@...are.org>
Subject: Re: [PATCH 1/2] zram: free meta out of init_lock

On (01/28/15 14:35), Minchan Kim wrote:
> I tested it with dd on /dev/zram0 without any FS on my KVM
> and I cannot see any measureable performance gap.
> Hmm, I will try it on real machine.

hm... no, it's 100% stable

 ./iozone -t 3 -R -r 16K -s 60M -I +Z

        test           base        srcu

 "  Initial write " 1274320.94  1251996.78
 "        Rewrite " 1965783.94  1994964.06
 "           Read " 4994070.75  4785895.88
 "        Re-read " 5134244.62  5010810.50
 "   Reverse Read " 4098531.38  4049988.38
 "    Stride read " 4577775.75  4263884.50
 "    Random read " 4131315.75  4636718.38
 " Mixed workload " 3675635.25  3854783.06
 "   Random write " 1832045.12  1863511.31
 "         Pwrite " 1238366.59  1258660.47
 "          Pread " 2475710.28  2404201.75
 "         Fwrite " 2410579.94  2396443.25
 "          Fread " 7723248.00  7127479.75

 "  Initial write " 1325167.41  1321517.41
 "        Rewrite " 2044098.62  2161141.06
 "           Read " 5267661.12  6203909.25
 "        Re-read " 5458601.62  5773477.12
 "   Reverse Read " 5001896.25  5103856.12
 "    Stride read " 4858877.62  5003335.25
 "    Random read " 4620529.88  4685374.62
 " Mixed workload " 3868978.19  3939195.31
 "   Random write " 2037816.75  1949729.56
 "         Pwrite " 1298255.91  1323038.47
 "          Pread " 2688768.09  2957903.06
 "         Fwrite " 2482632.44  2351247.50
 "          Fread " 7905214.75  7500859.75

 "  Initial write " 1334890.88  1332275.59
 "        Rewrite " 2061126.00  2152643.69
 "           Read " 5749209.88  5652791.62
 "        Re-read " 5845869.00  6261777.25
 "   Reverse Read " 4681375.12  4875618.50
 "    Stride read " 4760689.75  5242670.00
 "    Random read " 5112395.75  4650536.62
 " Mixed workload " 4129292.06  4075847.88
 "   Random write " 2067824.19  2022719.88
 "         Pwrite " 1328648.88  1334709.97
 "          Pread " 2607281.94  2581113.12
 "         Fwrite " 2404771.38  2348427.62
 "          Fread " 7903982.75  7486812.50

	-ss
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