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...in_on_owner. These spin_on_onwer variant also cause rcu stall before we apply this patch set We also have observed some performace improvements. PPC test result: 1 copy - 0.94% 2 copy - 7.17% 4 copy - 11.9% 8 copy - 3.04% 16 copy - 15.11% details below: Without patch: 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) 8 copy - File Write 4096 bufsize 8000 maxblocks 1032658.0 K...

...in_on_owner. These spin_on_onwer variant also cause rcu stall before we apply this patch set We also have observed some performace improvements. PPC test result: 1 copy - 0.94% 2 copy - 7.17% 4 copy - 11.9% 8 copy - 3.04% 16 copy - 15.11% details below: Without patch: 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) 8 copy - File Write 4096 bufsize 8000 maxblocks 1032658.0 K...

...926 ] Building with clang results in some warnings about the use of GNU old-style field designators: ----------------------------------------------------------------------- output.c:86:2: warning: use of GNU old-style field designator extension [-Wgnu-designator] nextc: 0, end: 0, buf: 0, bufsize: OUTBUFSIZ, fd: 1, flags: 0 ^~~~~~ .nextc = ... ----------------------------------------------------------------------- Fix the issue bu using C99 initializers instead. This should be safe and should not introduce any compatibility problems as it is done already in other parts of...

...ly this patch set > > We also have observed some performace improvements. > > PPC test result: > > 1 copy - 0.94% > 2 copy - 7.17% > 4 copy - 11.9% > 8 copy - 3.04% > 16 copy - 15.11% > > details below: > Without patch: > > 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) > 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) > 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) > 8 copy - File Write 4096 bufsize 8000 maxblocks...

...2' when in fact 'nbuf + 1' chars have been stored in 'buf' so far. Quickest fix: Index: src/main/dcf.c =================================================================== --- src/main/dcf.c (revision 69404) +++ src/main/dcf.c (working copy) @@ -50,7 +50,7 @@ if(nbuf+2 >= bufsize) { // allow for terminator below bufsize *= 2; char *buf2 = R_alloc(bufsize, sizeof(char)); - memcpy(buf2, buf, nbuf); + memcpy(buf2, buf, nbuf + 1); buf = buf2; } if(c != '\n'){ However a better fix would be to have 'nbuf' actually contain the n...

...ly this patch set > > We also have observed some performace improvements. > > PPC test result: > > 1 copy - 0.94% > 2 copy - 7.17% > 4 copy - 11.9% > 8 copy - 3.04% > 16 copy - 15.11% > > details below: > Without patch: > > 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) > 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) > 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) > 8 copy - File Write 4096 bufsize 8000 maxblocks...

...gt; > We also have observed some performace improvements in uninx benchmark tests. > > PPC test result: > 1 copy - 0.94% > 2 copy - 7.17% > 4 copy - 11.9% > 8 copy - 3.04% > 16 copy - 15.11% > > details below: > Without patch: > > 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) > 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) > 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) > 8 copy - File Write 4096 bufsize 8000 maxblocks...

...on_onwer variant also cause rcu stall before we apply this patch set We also have observed some performace improvements in uninx benchmark tests. PPC test result: 1 copy - 0.94% 2 copy - 7.17% 4 copy - 11.9% 8 copy - 3.04% 16 copy - 15.11% details below: Without patch: 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) 8 copy - File Write 4096 bufsize 8000 maxblocks 1032658.0 K...

...on_onwer variant also cause rcu stall before we apply this patch set We also have observed some performace improvements in uninx benchmark tests. PPC test result: 1 copy - 0.94% 2 copy - 7.17% 4 copy - 11.9% 8 copy - 3.04% 16 copy - 15.11% details below: Without patch: 1 copy - File Write 4096 bufsize 8000 maxblocks 2188223.0 KBps (30.0 s, 1 samples) 2 copy - File Write 4096 bufsize 8000 maxblocks 1804433.0 KBps (30.0 s, 1 samples) 4 copy - File Write 4096 bufsize 8000 maxblocks 1237257.0 KBps (30.0 s, 1 samples) 8 copy - File Write 4096 bufsize 8000 maxblocks 1032658.0 K...

Add an option ''s'' to set bufsize in logical to inode transition, then we are able to read all the refs to the logical address. Meanwhile, set a max value 64k for the bufsize. Signed-off-by: Liu Bo <bo.li.liu@oracle.com> --- v2->v3: - use 64k as the upper limit - document command''s options cmds-inspect...

...------ #include <pwd.h> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <errno.h> #include <sys/types.h> #include <dirent.h> int main(int argc, char *argv[]) { struct passwd pwd; struct passwd *result; char *buf; size_t bufsize; int s; if (argc != 3) { fprintf(stderr, "Usage: %s username directory\n", argv[0]); exit(EXIT_FAILURE); } bufsize = sysconf(_SC_GETPW_R_SIZE_MAX); if (bufsize == -1) /* Value was indeterminate */ bufsize = 16384; /* Should be m...

...ted >>= 1; subtype = 0; goto dostr; diff --git a/usr/dash/output.c b/usr/dash/output.c index f62e7eab0b4e..bb7c6ada155d 100644 --- a/usr/dash/output.c +++ b/usr/dash/output.c @@ -71,27 +71,27 @@ #ifdef USE_GLIBC_STDIO struct output output = { - stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 1, flags: 0 + .stream = 0, .nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = 1, .flags = 0 }; struct output errout = { - stream: 0, nextc: 0, end: 0, buf: 0, bufsize: 0, fd: 2, flags: 0 + .stream = 0, .nextc = 0, .end = 0, .buf = 0, .bufsize = 0, .fd = 2, .flags = 0 } #ifdef notyet...

...Signed-off-by: Ben Hutchings <ben at decadent.org.uk> --- usr/dash/output.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/usr/dash/output.c b/usr/dash/output.c index 3e1ae256..4d3b4c27 100644 --- a/usr/dash/output.c +++ b/usr/dash/output.c @@ -154,10 +154,13 @@ buffered: if (!bufsize) { ; } else if (dest->buf == NULL) { +#ifdef notyet if (dest->fd == MEM_OUT && len > bufsize) { bufsize = len; } +#endif offset = 0; +#ifdef notyet goto alloc; } else if (dest->fd == MEM_OUT) { offset = bufsize; @@ -169,6 +172,7 @@ buffered: if (buf...

...Signed-off-by: Ben Hutchings <ben at decadent.org.uk> --- usr/dash/output.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/usr/dash/output.c b/usr/dash/output.c index f9d87a6a..fb6b60ab 100644 --- a/usr/dash/output.c +++ b/usr/dash/output.c @@ -154,10 +154,13 @@ buffered: if (!bufsize) { ; } else if (dest->buf == NULL) { +#ifdef notyet if (dest->fd == MEM_OUT && len > bufsize) { bufsize = len; } +#endif offset = 0; +#ifdef notyet goto alloc; } else if (dest->fd == MEM_OUT) { offset = bufsize; @@ -169,6 +172,7 @@ buffered: if (buf...

...Dilbert -------------- next part -------------- *** icecast-1.3.12/src/ice_string.c 2002-04-10 23:26:42.000000000 +0100 --- icecast-1.3.12.japc/src/ice_string.c 2002-10-23 16:59:10.000000000 +0100 *************** *** 475,495 **** remains = remains % 60; if (days > 0) ! snprintf(buf, BUFSIZE, "%lu days, %lu hours, %lu minutes", days, hours, remains); ! else if (hours > 0) ! snprintf(buf, BUFSIZE, "%lu hours, %lu minutes", hours, remains); else { snprintf(buf, BUFSIZE, "%lu minutes", remains); return buf; } - if (remains > 0)...

...Dilbert -------------- next part -------------- *** icecast-1.3.12/src/ice_string.c 2002-04-10 23:26:42.000000000 +0100 --- icecast-1.3.12.japc/src/ice_string.c 2002-10-23 16:59:10.000000000 +0100 *************** *** 475,495 **** remains = remains % 60; if (days > 0) ! snprintf(buf, BUFSIZE, "%lu days, %lu hours, %lu minutes", days, hours, remains); ! else if (hours > 0) ! snprintf(buf, BUFSIZE, "%lu hours, %lu minutes", hours, remains); else { snprintf(buf, BUFSIZE, "%lu minutes", remains); return buf; } - if (remains > 0)...

...linux/kernel.h> +#include <linux/module.h> +#include <linux/pstore.h> +#include <linux/virtio.h> +#include <linux/virtio_config.h> +#include <uapi/linux/virtio_ids.h> +#include <uapi/linux/virtio_pstore.h> + +#define VIRT_PSTORE_ORDER 2 +#define VIRT_PSTORE_BUFSIZE (4096 << VIRT_PSTORE_ORDER) +#define VIRT_PSTORE_NR_REQ 128 + +struct virtio_pstore { + struct virtio_device *vdev; + struct virtqueue *vq[2]; + struct pstore_info pstore; + struct virtio_pstore_req req[VIRT_PSTORE_NR_REQ]; + struct virtio_pstore_res res[VIRT_PSTORE_NR_REQ]; + unsigned i...

...linux/kernel.h> +#include <linux/module.h> +#include <linux/pstore.h> +#include <linux/virtio.h> +#include <linux/virtio_config.h> +#include <uapi/linux/virtio_ids.h> +#include <uapi/linux/virtio_pstore.h> + +#define VIRT_PSTORE_ORDER 2 +#define VIRT_PSTORE_BUFSIZE (4096 << VIRT_PSTORE_ORDER) +#define VIRT_PSTORE_NR_REQ 128 + +struct virtio_pstore { + struct virtio_device *vdev; + struct virtqueue *vq[2]; + struct pstore_info pstore; + struct virtio_pstore_req req[VIRT_PSTORE_NR_REQ]; + struct virtio_pstore_res res[VIRT_PSTORE_NR_REQ]; + unsigned i...

Based on some tests we ran, it seems the biggest performance hit you get from running within domU is from disk I/O. We did some mysql read and write tests, and for both, our performance is about half that compared to native. Has that been others'' experience? Is there any way to make this better? We are using physical partitions. In contrast, cpu/memory tests appear to be near

...have been stored in 'buf' so far. > > Quickest fix: > > Index: src/main/dcf.c > =================================================================== > --- src/main/dcf.c (revision 69404) > +++ src/main/dcf.c (working copy) > @@ -50,7 +50,7 @@ > if(nbuf+2 >= bufsize) { // allow for terminator below > bufsize *= 2; > char *buf2 = R_alloc(bufsize, sizeof(char)); > - memcpy(buf2, buf, nbuf); > + memcpy(buf2, buf, nbuf + 1); > buf = buf2; > } > if(c != '\n'){ > > However a better fix would be...