Date: Tue, 31 May 2011 15:47:20 -0700 From: mdf@FreeBSD.org To: Pieter de Goeje <pieter@degoeje.nl>, Bruce Evans <brde@optusnet.com.au> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, src-committers@freebsd.org Subject: Re: svn commit: r221853 - in head/sys: dev/md dev/null sys vm Message-ID: <BANLkTi=o_NUTN1wABx3_7GnUgXUs3divcQ@mail.gmail.com> In-Reply-To: <201105312348.59571.pieter@degoeje.nl> References: <201105131848.p4DIm1j7079495@svn.freebsd.org> <201105282103.43370.pieter@degoeje.nl> <BANLkTimJY65boMPhnnT344cmwRUJ0Z=dSQ@mail.gmail.com> <201105312348.59571.pieter@degoeje.nl>
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--000e0ce0d960c6ad8b04a49a2ff1 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Tue, May 31, 2011 at 2:48 PM, Pieter de Goeje <pieter@degoeje.nl> wrote: > On Sunday 29 May 2011 05:01:57 mdf@freebsd.org wrote: >> On Sat, May 28, 2011 at 12:03 PM, Pieter de Goeje <pieter@degoeje.nl> wr= ote: >> > To me it looks like it's not able to cache the zeroes anymore. Is this >> > intentional? I tried to change ZERO_REGION_SIZE back to 64K but that >> > didn't help. >> >> Hmm. =A0I don't have access to my FreeBSD box over the weekend, but I'll >> run this on my box when I get back to work. >> >> Meanwhile you could try setting ZERO_REGION_SIZE to PAGE_SIZE and I >> think that will restore things to the original performance. > > Indeed it does. I couldn't find any authoritative docs stating wether or = not > the cache on this CPU is virtually indexed, but apparently at least some = of > it is. On my physical box (some Dell thing from about 2008), I ran 10 loops of dd if=3D/dev/zero of=3D/dev/null bs=3DXX count=3DXX where bs went by pow= ers of 2 from 512 bytes to 2M, and count was set so that the dd always transferred 8GB. I compared ZERO_REGION_SIZE of 64k and 2M on amd64. The summary of the ministat(1) output is: bs=3D512b - no difference bs=3D1K - no difference bs=3D2k - no difference bs=3D4k - no difference bs=3D8k - no difference bs=3D16k - no difference bs=3D32k - no difference bs=3D64k - no difference bs=3D128k - 2M is 0.69% faster bs=3D256k - 2M is 0.98% faster bs=3D512k - 2M is 0.65% faster bs=3D1M - 2M is 1.02% faster bs=3D2M - 2M is 2.17% slower I'll play again with a 4K buffer. For some applications (/dev/zero) a small size is sufficient. For some (md(4)) a ZERO_REGION_SIZE at least as large as the sectorsize is desired so that a single kernel buffer pointer can be used to set up a uio for VOP_WRITE(9). Attached is the ministat output; I hope it makes it. :-) Thanks, matthew --000e0ce0d960c6ad8b04a49a2ff1 Content-Type: text/plain; charset=US-ASCII; name="zero-ministat.txt" Content-Disposition: attachment; filename="zero-ministat.txt" Content-Transfer-Encoding: base64 X-Attachment-Id: f_godfv02p0 eCAvZGF0YS96ZXJvLWFtZDY0LXNtYWxsL3plcm8tNTEyLnR4dAorIC9kYXRhL3plcm8tYW1kNjQt bGFyZ2UvemVyby01MTIudHh0CistLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLSsKfCAgICAgICAgICAgICAgICAg ICAgICAgICAgICAgKyAgICAgICAgICAgeCAgICAgICAgICAgICAgICAgICAgICAgICAgICAgICAg fAp8KyAgICAgICAgICAgICAgICAgICAgICArICAgICAreCp4KyAgK3ggeCAqICB4KyAgICB4ICsg ICAgICAgICAgICAgICAgICAgIHh8CnwgICAgICAgICAgICAgICAgICB8X19fX19fX19fX3xfX0FN X19fX19fX01BX19ffF9fX19fX198ICAgICAgICAgICAgICAgICAgIHwKKy0tLS0tLS0tLS0tLS0t LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t LS0tKwogICAgTiAgICAgICAgICAgTWluICAgICAgICAgICBNYXggICAgICAgIE1lZGlhbiAgICAg 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