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...********************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6 4.2G 3.6G 453M 89% /tmp /dev/sda5 938M 205M 685M 23% /var cctest1$ dmesg | grep DMA DMA zone: 101376 pages, LIFO batch:16 cctest1$ for i in `seq 1 10`; do hdparm -tT /dev/sda1; done Timing cached reads: 512 MB in 2.00 seconds = 256.00 MB/sec Timing buffered disk reads: 44 MB in 3.00 seconds = 14.67 MB/sec Timing c...

...********************************************************** cctest1$ df -lh Filesystem Size Used Avail Use% Mounted on /dev/sda1 1.5G 1.1G 306M 78% / tmpfs 62M 4.0K 62M 1% /dev/shm /dev/sda6 4.2G 3.6G 453M 89% /tmp /dev/sda5 938M 205M 685M 23% /var cctest1$ dmesg | grep DMA DMA zone: 101376 pages, LIFO batch:16 cctest1$ for i in `seq 1 10`; do hdparm -tT /dev/sda1; done Timing cached reads: 512 MB in 2.00 seconds = 256.00 MB/sec Timing buffered disk reads: 44 MB in 3.00 seconds = 14.67 MB/sec Timing c...

...paritiions as shown below: Filesystem Size Used Avail Use% Mounted on /dev/md5 939M 237M 654M 27% / /dev/md0 91M 22M 65M 25% /boot /dev/md6 277M 8.1M 254M 4% /tmp /dev/md7 1.8G 1.3G 595M 69% /usr /dev/md8 938M 761M 177M 82% /var /dev/md9 9.2G 2.6G 6.1G 30% /home /dev/md10 11G 2.1G 8.7G 19% /scratch /dev/md12 56G 43G 13G 77% /global The /usr and /var filesystems keep switching to ro mode following the detection of errors. This has been happening on a d...

...paritiions as shown below: Filesystem Size Used Avail Use% Mounted on /dev/md5 939M 237M 654M 27% / /dev/md0 91M 22M 65M 25% /boot /dev/md6 277M 8.1M 254M 4% /tmp /dev/md7 1.8G 1.3G 595M 69% /usr /dev/md8 938M 761M 177M 82% /var /dev/md9 9.2G 2.6G 6.1G 30% /home /dev/md10 11G 2.1G 8.7G 19% /scratch /dev/md12 56G 43G 13G 77% /global The /usr and /var filesystems keep switching to ro mode following the detection of errors. This has been happening on a d...

Dear all, When I debugged the execution performance of an application using strace, I found there are some system calls like open and stat64 which run faster on XenLinux than the standard Linux. The following is the output of running "strace -c /bin/sh -c /bin/echo foo" on both systems. An open call runs averagely 109 usec on standard Linux but only 41 usecs on XenLinux. An stat64