search for: 1mbytes

Hello, We found that fsync and fdatasync syscalls sometimes don't sync data in an ext3 file system under the following conditions. 1. Kernel version is 2.6.6 or later (including 2.6.8.1 and 2.6.9-rc2). 2. Ext3's journalling mode is "data=journal". 3. Create a file (whose size is 1Mbytes) and execute umount/mount. 4. lseek to a random position within the file, write 8192 bytes data, and fsync or fdatasync. We presume the data was not written to the corresponding disk before returning from fsync or fdatasync syscall on the evidence as follows: 1. The response time of fsync() an...

...y to the page, so memory copies are word/page align and therefore faster, ie. 4 bytes are copied at once instead of a byte at once. 4. If you use GigaBit ethernet to get performance you need to read/write 64Kbytes to the socket and let the OS break it up into MTU sized packets, or better even send 1Mbytes to the socket. I would change the rsync code, but could not find any into on the variables, so that I could safely change the code, and known it still works. Damon. http://mobile.yahoo.com.au - Yahoo! Messenger for SMS - Now send & receive IMs on your mobile via SMS

...nd use 16384, the transfer file slow down at 3Mbits/s. uh oh. sound bad. I'll do some other test this week end in my home configuration (FTP, NFS transfer files) to see if this is not related to a connection problem. (I'm not sure, but I think the NFS transfer is more likely 4MBytes/s than 1Mbytes at home) Here, *really* puzzled. Why samba is so slow? A weird idea comes in my mind: What about Windows 2000, as a PDC, performances? At work: Duron 700, 256Mo RAM 100Mb Windows 2000 server, acts as PDC. Launch a 100Mo file copy on PDC. It takes 2 minutes. Uh oh? It's less than 8Mbits/s tr...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major changes of these releases are: - dm-ioband can be configured through the cgroup interface. The bandwidth can be assigned on a per cgroup per block device basis. - The event tracing is supported that helps in debugging and monitoring dm-ioband. - A document for blkio-cgroup is available at

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major changes of these releases are: - dm-ioband can be configured through the cgroup interface. The bandwidth can be assigned on a per cgroup per block device basis. - The event tracing is supported that helps in debugging and monitoring dm-ioband. - A document for blkio-cgroup is available at

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major changes of these releases are: - dm-ioband can be configured through the cgroup interface. The bandwidth can be assigned on a per cgroup per block device basis. - The event tracing is supported that helps in debugging and monitoring dm-ioband. - A document for blkio-cgroup is available at

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

...he group is determined by ID. If -1 is specified + as ID, the default ioband group is chosen. + + The following example means that "ioband1" can use + 5M~6Mbytes/sec bandwidth of the underlying block device while + "ioband2" can use 900K~1Mbytes/sec bandwidth. + + # dmsetup message -- ioband1 0 range-bw -1:5000:6000 + + # dmsetup message -- ioband2 0 range-bw -1:900:1000 + + + MIN-BW and MAX-BW and must be an integer larger than 0 and its + unit is Kbyte/sec. + + EXAMPLE + + Set t...

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major change of these releases is that a hierarchical configuration is supported, a parent cgroup's bandwidth is distributed to its children. The hierarchical configuration is available when using dm-ioband and blkio-cgroup together. Please refer to the documentation included in this series of patches on how to use it. The

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major change of these releases is that a hierarchical configuration is supported, a parent cgroup's bandwidth is distributed to its children. The hierarchical configuration is available when using dm-ioband and blkio-cgroup together. Please refer to the documentation included in this series of patches on how to use it. The

Hi all, These are new releases of dm-ioband and blkio-cgroup. The major change of these releases is that a hierarchical configuration is supported, a parent cgroup's bandwidth is distributed to its children. The hierarchical configuration is available when using dm-ioband and blkio-cgroup together. Please refer to the documentation included in this series of patches on how to use it. The