search for: chunk_size

..., base: 3256MB, range: 8MB, type UC reg 3, base: 3264MB, range: 64MB, type UC reg 4, base: 3328MB, range: 256MB, type UC reg 5, base: 3584MB, range: 512MB, type UC reg 6, base: 17150MB, range: 2MB, type UC reg 7, base: 17152MB, range: 256MB, type UC total RAM covered: 16310M gran_size: 64K chunk_size: 64K num_reg: 10 lose cover RAM: 126M gran_size: 64K chunk_size: 128K num_reg: 10 lose cover RAM: 126M gran_size: 64K chunk_size: 256K num_reg: 10 lose cover RAM: 126M gran_size: 64K chunk_size: 512K num_reg: 10 lose cover...

Good Day All, Today I looked at the dmesg log and I notice that the following messages regarding mtrr_gran_size/mtrr_chunk_size. I am currently running CentOS 6.3 and I installed CentOS 6.2 and 6.1 and I was seeing the same errors. When I installed CentOS 5.8 on the same laptop I do not see these errors. $ lsb_release -a LSB Version: :core-4.0-amd64:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-noarch:printing-4.0-amd64...

...t has been running 5.x - 5.8 for a few years without issue and decided to move it to a fresh install of 6.2. First thing I noticed is a good part of the log has these mtrr messages finally ending with "mtrr_cleanup: can not find optimal value" and "please specify mtrr_gran_size/mtrr_chunk_size". I have been searching around and reading the kernel docs but are bit lost on the impact. The system CPU is a q6600 so it supports mtrr. It has 8gb of RAM and a G33 intel chipset (maximum memory is 8gb), 256mb onboard Intel video. Problem exists with DVD 6.2 kernel and latest in yum update...

When a whole-file checksum is performed, hashing was done in 64 byte blocks, causing overhead and limiting performance. Testing showed the performance improvement to go up quickly going from 64 to 512 bytes, with diminishing returns above, 4096 was where it seemed to plateau for me. Re-used CHUNK_SIZE (32 kB) as it already exists and should be fine to use here anyway. Noticed this because I'm playing with a parallel MD5 implementation, and it benchmarked about the same as xxhash on the CPUs I used for testing, which should not be the case. Discovered performance was limited by CSUM_CHUNK re...

...OS 6.4, current, Dell PE R720. Had an issue today with a bus error, and googling only found two year old references to problems with non-Dell drives (we just added two WD Reds, and mdadm raided them). So, looking through dmesg and /var/log/messages, I ran into a *lot* of G gran_size: 128K chunk_size: 256K num_reg: 10 lose cover RAM: 0G gran_size: 128K chunk_size: 512K num_reg: 10 lose cover RAM: 0G gran_size: 128K chunk_size: 1M num_reg: 10 lose cover RAM: 0G gran_size: 128K chunk_size: 2M num_reg: 10 lose cover RAM: 0G gran_size: 128K...

...Aug 2004 02:31:02 -0000 @@ -23,6 +23,7 @@ #include "rsync.h" extern int sparse_files; +int total_bytes_memmoved=0; static char last_byte; static int last_sparse; @@ -182,8 +183,7 @@ /* nope, we are going to have to do a read. Work out our desired window */ if (offset > 2*CHUNK_SIZE) { - window_start = offset - 2*CHUNK_SIZE; - window_start &= ~((OFF_T)(CHUNK_SIZE-1)); /* assumes power of 2 */ + window_start = offset; } else { window_start = 0; } @@ -212,6 +212,7 @@ read_offset = read_start - window_start; read_size = window_size - read_offset; memmove(ma...

..._root *root, int mixed) BTRFS_BLOCK_GROUP_SYSTEM, BTRFS_FIRST_CHUNK_TREE_OBJECTID, 0, BTRFS_MKFS_SYSTEM_GROUP_SIZE); - BUG_ON(ret); + if (ret) + goto err; if (mixed) { ret = btrfs_alloc_chunk(trans, root->fs_info->extent_root, &chunk_start, &chunk_size, BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA); - BUG_ON(ret); + if (ret) + goto err; ret = btrfs_make_block_group(trans, root, 0, BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_DATA, BTRFS_FIRST_CHUNK_TREE_OBJECTID, chunk_start,...

...you did not get a pool here? I don't think that should happen unless things were really bad already? > +} > + > +void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev, > + size_t size) > +{ > + dma_addr_t dma_addr; > + unsigned long addr; > + size_t chunk_size; > + > + addr = gen_pool_alloc(gp_dma, size); > + while (!addr) { > + chunk_size = round_up(size, PAGE_SIZE); > + addr = (unsigned long) dma_alloc_coherent(dma_dev, > + chunk_size, &dma_addr, CIO_DMA_GFP); > + if (!addr) > + return NULL; > + gen_pool_add_vi...

...you did not get a pool here? I don't think that should happen unless things were really bad already? > +} > + > +void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev, > + size_t size) > +{ > + dma_addr_t dma_addr; > + unsigned long addr; > + size_t chunk_size; > + > + addr = gen_pool_alloc(gp_dma, size); > + while (!addr) { > + chunk_size = round_up(size, PAGE_SIZE); > + addr = (unsigned long) dma_alloc_coherent(dma_dev, > + chunk_size, &dma_addr, CIO_DMA_GFP); > + if (!addr) > + return NULL; > + gen_pool_add_vi...

..._kernel_vmap_range to properly handle virtually indexed caches. Or with remapping you mean using the iommu do de-scatter/gather? You can implement that trivially implement it yourself for the iommu case: { merge_boundary = dma_get_merge_boundary(dev); if (!merge_boundary || merge_boundary > chunk_size - 1) { /* can't coalesce */ return -EINVAL; } nents = DIV_ROUND_UP(total_size, chunk_size); sg = sgl_alloc(); for_each_sgl() { sg->page = __alloc_pages(get_order(chunk_size)) sg->len = chunk_size; } dma_map_sg(sg, DMA_ATTR_SKIP_CPU_SYNC); // you are guaranteed to get a s...

.../* we're here because we seeked back within the read buffer. */ ret = emxstream->high_pos - stream->pos; stream->pos = emxstream->high_pos; emxstream->high_pos = 0; return ret; } emxstream->high_pos = 0; if (stream->pos + CHUNK_SIZE > stream->buffer_size) { /* try to keep at least CHUNK_SIZE available */ if (!emxstream->marked && stream->skip > 0) { /* don't try to keep anything cached if we don't have a seek mark. */ i_stream_compress(stream...

...ax.h> #include <syslinux/loadfile.h> #include <syslinux/config.h> @@ -749,7 +750,7 @@ void *load_one(char *file, ssize_t *file_size) if(size) { buf = malloc(size); for(i = 1, cur = 0 ; cur < size && i > 0; cur += i) { - i = save_read(fd, buf + cur, CHUNK_SIZE); + i = save_read(fd, buf + cur, min(CHUNK_SIZE, size - cur)); if(i == -1) break; gfx_progress_update(i); } -- 1.7.1

On Fri, 10 May 2019 00:11:12 +0200 Halil Pasic <pasic at linux.ibm.com> wrote: > On Thu, 9 May 2019 12:11:06 +0200 > Cornelia Huck <cohuck at redhat.com> wrote: > > > On Wed, 8 May 2019 23:22:10 +0200 > > Halil Pasic <pasic at linux.ibm.com> wrote: > > > > > On Wed, 8 May 2019 15:18:10 +0200 (CEST) > > > Sebastian Ott <sebott

On Fri, 10 May 2019 00:11:12 +0200 Halil Pasic <pasic at linux.ibm.com> wrote: > On Thu, 9 May 2019 12:11:06 +0200 > Cornelia Huck <cohuck at redhat.com> wrote: > > > On Wed, 8 May 2019 23:22:10 +0200 > > Halil Pasic <pasic at linux.ibm.com> wrote: > > > > > On Wed, 8 May 2019 15:18:10 +0200 (CEST) > > > Sebastian Ott <sebott

...@ -1063,7 +1063,10 @@ struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages) > static void __gp_dma_free_dma(struct gen_pool *pool, > struct gen_pool_chunk *chunk, void *data) > { > - dma_free_coherent((struct device *) data, PAGE_SIZE, > + > + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; > + > + dma_free_coherent((struct device *) data, chunk_size, > (void *) chunk->start_addr, > (dma_addr_t) chunk->phys_addr); > } > @@ -1088,13 +1091,15 @@ void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct dev...

...@ -1063,7 +1063,10 @@ struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages) > static void __gp_dma_free_dma(struct gen_pool *pool, > struct gen_pool_chunk *chunk, void *data) > { > - dma_free_coherent((struct device *) data, PAGE_SIZE, > + > + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; > + > + dma_free_coherent((struct device *) data, chunk_size, > (void *) chunk->start_addr, > (dma_addr_t) chunk->phys_addr); > } > @@ -1088,13 +1091,15 @@ void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct dev...

...ddr, + CIO_DMA_GFP); + if (!cpu_addr) + return gp_dma; + gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr, + dma_addr, PAGE_SIZE, -1); + } + return gp_dma; +} + +static void __gp_dma_free_dma(struct gen_pool *pool, + struct gen_pool_chunk *chunk, void *data) +{ + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; + + dma_free_coherent((struct device *) data, chunk_size, + (void *) chunk->start_addr, + (dma_addr_t) chunk->phys_addr); +} + +void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev) +{ + if (!gp_dma) + return; + /* thi...

...ddr, + CIO_DMA_GFP); + if (!cpu_addr) + return gp_dma; + gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr, + dma_addr, PAGE_SIZE, -1); + } + return gp_dma; +} + +static void __gp_dma_free_dma(struct gen_pool *pool, + struct gen_pool_chunk *chunk, void *data) +{ + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; + + dma_free_coherent((struct device *) data, chunk_size, + (void *) chunk->start_addr, + (dma_addr_t) chunk->phys_addr); +} + +void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev) +{ + if (!gp_dma) + return; + /* thi...

...+++ b/drivers/s390/cio/css.c @@ -1063,7 +1063,10 @@ struct gen_pool *cio_gp_dma_create(struct device *dma_dev, int nr_pages) static void __gp_dma_free_dma(struct gen_pool *pool, struct gen_pool_chunk *chunk, void *data) { - dma_free_coherent((struct device *) data, PAGE_SIZE, + + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; + + dma_free_coherent((struct device *) data, chunk_size, (void *) chunk->start_addr, (dma_addr_t) chunk->phys_addr); } @@ -1088,13 +1091,15 @@ void *cio_gp_dma_zalloc(struct gen_pool *gp_dma, struct device *dma_dev, { dma_addr_t...

...ddr, + CIO_DMA_GFP); + if (!cpu_addr) + return gp_dma; + gen_pool_add_virt(gp_dma, (unsigned long) cpu_addr, + dma_addr, PAGE_SIZE, -1); + } + return gp_dma; +} + +static void __gp_dma_free_dma(struct gen_pool *pool, + struct gen_pool_chunk *chunk, void *data) +{ + size_t chunk_size = chunk->end_addr - chunk->start_addr + 1; + + dma_free_coherent((struct device *) data, chunk_size, + (void *) chunk->start_addr, + (dma_addr_t) chunk->phys_addr); +} + +void cio_gp_dma_destroy(struct gen_pool *gp_dma, struct device *dma_dev) +{ + if (!gp_dma) + return; + /* thi...