diff for duplicates of <1291753963-sup-6290@think> diff --git a/a/1.txt b/N1/1.txt index 05f441d..b4b872a 100644 --- a/a/1.txt +++ b/N1/1.txt @@ -1,41 +1,54 @@ Excerpts from Jon Nelson's message of 2010-12-07 15:25:47 -0500: -> On Tue, Dec 7, 2010 at 2:02 PM, Chris Mason <chris.mason@oracle.com> wrote: +> On Tue, Dec 7, 2010 at 2:02 PM, Chris Mason <chris.mason@oracle.com> = +wrote: > > Excerpts from Jon Nelson's message of 2010-12-07 14:34:40 -0500: -> >> On Tue, Dec 7, 2010 at 12:52 PM, Chris Mason <chris.mason@oracle.com> wrote: -> >> >> postgresql errors. Typically, header corruption but from the limited -> >> >> visibility I've had into this via strace, what I see is zeroed pages +> >> On Tue, Dec 7, 2010 at 12:52 PM, Chris Mason <chris.mason@oracle.c= +om> wrote: +> >> >> postgresql errors. Typically, header corruption but from the li= +mited +> >> >> visibility I've had into this via strace, what I see is zeroed = +pages > >> >> where there shouldn't be. > >> > -> >> > This sounds a lot like a bug higher up than dm-crypt. Â Zeros tend to -> >> > come from some piece of code explicitly filling a page with zeros, and -> >> > that often happens in the corner cases for O_DIRECT and a few other +> >> > This sounds a lot like a bug higher up than dm-crypt. =C2=A0Zero= +s tend to +> >> > come from some piece of code explicitly filling a page with zero= +s, and +> >> > that often happens in the corner cases for O_DIRECT and a few ot= +her > >> > places in the filesystem. > >> > > >> > Have you tried triggering this with a regular block device? > >> -> >> I just tried the whole set of tests, but with /dev/sdb directly (as +> >> I just tried the whole set of tests, but with /dev/sdb directly (a= +s > >> ext4) without any crypt-y bits. -> >> It takes more iterations but out of 6 tests I had one failure: same +> >> It takes more iterations but out of 6 tests I had one failure: sam= +e > >> type of thing, 'invalid page header in block ....'. > >> -> >> I can't guarantee that it is a full-page of zeroes, just what I saw +> >> I can't guarantee that it is a full-page of zeroes, just what I sa= +w > >> from the (limited) stracing I did. > > > > Fantastic. Now for our usual suspects: > > -> > 1) Is postgres using O_DIRECT? Â If yes, please turn it off -> +> > 1) Is postgres using O_DIRECT? =C2=A0If yes, please turn it off +>=20 > According to strace, O_DIRECT didn't show up once during the test. -> -> > 2) Is postgres allocating sparse files? Â If yes, please have it fully +>=20 +> > 2) Is postgres allocating sparse files? =C2=A0If yes, please have i= +t fully > > allocate the file instead. -> -> That's a tough one. I don't think postgresql does that, but I'm not an +>=20 +> That's a tough one. I don't think postgresql does that, but I'm not a= +n > expert here. -> -> > 3) Is postgres using preallocation (fallocate)? Â If yes, please have it +>=20 +> > 3) Is postgres using preallocation (fallocate)? =C2=A0If yes, pleas= +e have it > > fully allocate the file instead -> +>=20 > As far as strace is concerned, postgreql is not using fallocate in > this version. @@ -45,6 +58,7 @@ on the files? -chris -- -To unsubscribe from this list: send the line "unsubscribe linux-ext4" in +To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= +n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/a/content_digest b/N1/content_digest index f22faa2..9dc1e84 100644 --- a/a/content_digest +++ b/N1/content_digest @@ -31,43 +31,56 @@ "\00:1\0" "b\0" "Excerpts from Jon Nelson's message of 2010-12-07 15:25:47 -0500:\n" - "> On Tue, Dec 7, 2010 at 2:02 PM, Chris Mason <chris.mason@oracle.com> wrote:\n" + "> On Tue, Dec 7, 2010 at 2:02 PM, Chris Mason <chris.mason@oracle.com> =\n" + "wrote:\n" "> > Excerpts from Jon Nelson's message of 2010-12-07 14:34:40 -0500:\n" - "> >> On Tue, Dec 7, 2010 at 12:52 PM, Chris Mason <chris.mason@oracle.com> wrote:\n" - "> >> >> postgresql errors. Typically, header corruption but from the limited\n" - "> >> >> visibility I've had into this via strace, what I see is zeroed pages\n" + "> >> On Tue, Dec 7, 2010 at 12:52 PM, Chris Mason <chris.mason@oracle.c=\n" + "om> wrote:\n" + "> >> >> postgresql errors. Typically, header corruption but from the li=\n" + "mited\n" + "> >> >> visibility I've had into this via strace, what I see is zeroed =\n" + "pages\n" "> >> >> where there shouldn't be.\n" "> >> >\n" - "> >> > This sounds a lot like a bug higher up than dm-crypt. \303\202\302\240Zeros tend to\n" - "> >> > come from some piece of code explicitly filling a page with zeros, and\n" - "> >> > that often happens in the corner cases for O_DIRECT and a few other\n" + "> >> > This sounds a lot like a bug higher up than dm-crypt. =C2=A0Zero=\n" + "s tend to\n" + "> >> > come from some piece of code explicitly filling a page with zero=\n" + "s, and\n" + "> >> > that often happens in the corner cases for O_DIRECT and a few ot=\n" + "her\n" "> >> > places in the filesystem.\n" "> >> >\n" "> >> > Have you tried triggering this with a regular block device?\n" "> >>\n" - "> >> I just tried the whole set of tests, but with /dev/sdb directly (as\n" + "> >> I just tried the whole set of tests, but with /dev/sdb directly (a=\n" + "s\n" "> >> ext4) without any crypt-y bits.\n" - "> >> It takes more iterations but out of 6 tests I had one failure: same\n" + "> >> It takes more iterations but out of 6 tests I had one failure: sam=\n" + "e\n" "> >> type of thing, 'invalid page header in block ....'.\n" "> >>\n" - "> >> I can't guarantee that it is a full-page of zeroes, just what I saw\n" + "> >> I can't guarantee that it is a full-page of zeroes, just what I sa=\n" + "w\n" "> >> from the (limited) stracing I did.\n" "> >\n" "> > Fantastic. Now for our usual suspects:\n" "> >\n" - "> > 1) Is postgres using O_DIRECT? \303\202\302\240If yes, please turn it off\n" - "> \n" + "> > 1) Is postgres using O_DIRECT? =C2=A0If yes, please turn it off\n" + ">=20\n" "> According to strace, O_DIRECT didn't show up once during the test.\n" - "> \n" - "> > 2) Is postgres allocating sparse files? \303\202\302\240If yes, please have it fully\n" + ">=20\n" + "> > 2) Is postgres allocating sparse files? =C2=A0If yes, please have i=\n" + "t fully\n" "> > allocate the file instead.\n" - "> \n" - "> That's a tough one. I don't think postgresql does that, but I'm not an\n" + ">=20\n" + "> That's a tough one. I don't think postgresql does that, but I'm not a=\n" + "n\n" "> expert here.\n" - "> \n" - "> > 3) Is postgres using preallocation (fallocate)? \303\202\302\240If yes, please have it\n" + ">=20\n" + "> > 3) Is postgres using preallocation (fallocate)? =C2=A0If yes, pleas=\n" + "e have it\n" "> > fully allocate the file instead\n" - "> \n" + ">=20\n" "> As far as strace is concerned, postgreql is not using fallocate in\n" "> this version.\n" "\n" @@ -77,8 +90,9 @@ "\n" "-chris\n" "--\n" - "To unsubscribe from this list: send the line \"unsubscribe linux-ext4\" in\n" + "To unsubscribe from this list: send the line \"unsubscribe linux-ext4\" i=\n" + "n\n" "the body of a message to majordomo@vger.kernel.org\n" More majordomo info at http://vger.kernel.org/majordomo-info.html -4bf3852ec2d534541b3d2b495cb98afe8a31138ce2b3fa2a0174c378a7fe3117 +fe5f87fe3b7d7215f24547f26d2118817f5f79c09d540145f3d9292457848f98
diff --git a/a/1.txt b/N2/1.txt index 05f441d..bd51750 100644 --- a/a/1.txt +++ b/N2/1.txt @@ -6,7 +6,7 @@ Excerpts from Jon Nelson's message of 2010-12-07 15:25:47 -0500: > >> >> visibility I've had into this via strace, what I see is zeroed pages > >> >> where there shouldn't be. > >> > -> >> > This sounds a lot like a bug higher up than dm-crypt. Â Zeros tend to +> >> > This sounds a lot like a bug higher up than dm-crypt. Zeros tend to > >> > come from some piece of code explicitly filling a page with zeros, and > >> > that often happens in the corner cases for O_DIRECT and a few other > >> > places in the filesystem. @@ -23,17 +23,17 @@ Excerpts from Jon Nelson's message of 2010-12-07 15:25:47 -0500: > > > > Fantastic. Now for our usual suspects: > > -> > 1) Is postgres using O_DIRECT? Â If yes, please turn it off +> > 1) Is postgres using O_DIRECT? If yes, please turn it off > > According to strace, O_DIRECT didn't show up once during the test. > -> > 2) Is postgres allocating sparse files? Â If yes, please have it fully +> > 2) Is postgres allocating sparse files? If yes, please have it fully > > allocate the file instead. > > That's a tough one. I don't think postgresql does that, but I'm not an > expert here. > -> > 3) Is postgres using preallocation (fallocate)? Â If yes, please have it +> > 3) Is postgres using preallocation (fallocate)? If yes, please have it > > fully allocate the file instead > > As far as strace is concerned, postgreql is not using fallocate in @@ -44,7 +44,3 @@ that you're using read/write for file IO or is it doing a lot of mmaps on the files? -chris --- -To unsubscribe from this list: send the line "unsubscribe linux-ext4" in -the body of a message to majordomo@vger.kernel.org -More majordomo info at http://vger.kernel.org/majordomo-info.html diff --git a/a/content_digest b/N2/content_digest index f22faa2..a915730 100644 --- a/a/content_digest +++ b/N2/content_digest @@ -38,7 +38,7 @@ "> >> >> visibility I've had into this via strace, what I see is zeroed pages\n" "> >> >> where there shouldn't be.\n" "> >> >\n" - "> >> > This sounds a lot like a bug higher up than dm-crypt. \303\202\302\240Zeros tend to\n" + "> >> > This sounds a lot like a bug higher up than dm-crypt. \302\240Zeros tend to\n" "> >> > come from some piece of code explicitly filling a page with zeros, and\n" "> >> > that often happens in the corner cases for O_DIRECT and a few other\n" "> >> > places in the filesystem.\n" @@ -55,17 +55,17 @@ "> >\n" "> > Fantastic. Now for our usual suspects:\n" "> >\n" - "> > 1) Is postgres using O_DIRECT? \303\202\302\240If yes, please turn it off\n" + "> > 1) Is postgres using O_DIRECT? \302\240If yes, please turn it off\n" "> \n" "> According to strace, O_DIRECT didn't show up once during the test.\n" "> \n" - "> > 2) Is postgres allocating sparse files? \303\202\302\240If yes, please have it fully\n" + "> > 2) Is postgres allocating sparse files? \302\240If yes, please have it fully\n" "> > allocate the file instead.\n" "> \n" "> That's a tough one. I don't think postgresql does that, but I'm not an\n" "> expert here.\n" "> \n" - "> > 3) Is postgres using preallocation (fallocate)? \303\202\302\240If yes, please have it\n" + "> > 3) Is postgres using preallocation (fallocate)? \302\240If yes, please have it\n" "> > fully allocate the file instead\n" "> \n" "> As far as strace is concerned, postgreql is not using fallocate in\n" @@ -75,10 +75,6 @@ "that you're using read/write for file IO or is it doing a lot of mmaps\n" "on the files?\n" "\n" - "-chris\n" - "--\n" - "To unsubscribe from this list: send the line \"unsubscribe linux-ext4\" in\n" - "the body of a message to majordomo@vger.kernel.org\n" - More majordomo info at http://vger.kernel.org/majordomo-info.html + -chris -4bf3852ec2d534541b3d2b495cb98afe8a31138ce2b3fa2a0174c378a7fe3117 +9ebdc47036f3c518d6ded873c41a789f385a29a006b0254af90eb81c3f47c2a7
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