Re: [PATCH 1/2] zram: free meta out of init_lock

Sergey Senozhatsky
2015-01-28T06:08:30Z

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