in a different shell: dd if=/dev/zero of=/dev/pktcdvd/dvdrw bs=32768 count=25000 25000+0 records in 25000+0 records out 819200000 bytes (819 MB) copied, 86.4149 seconds, 9.5 MB/s niess@stingray ~ $ while true; do grep hdc /proc/diskstats ; grep pktc /proc/diskstats ;sleep 1;done 22 0 hdc 40373 834 326032 1934172 92721 340009 8036648 27999652 8 2380168 29933912 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 93063 340009 8058536 28007716 8 2381180 29941984 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 93405 340009 8080424 28015796 8 2382192 29950072 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 93747 340009 8102312 28023876 8 2383204 29958156 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 94090 340009 8124264 28031972 8 2384216 29966232 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 94438 340009 8146536 28040184 8 2385248 29974468 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 94780 340009 8168424 28048256 8 2386256 29982516 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 95122 340009 8190312 28056340 8 2387268 29990608 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 95464 340009 8212200 28064396 8 2388280 29998668 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 95806 340009 8234088 28072484 8 2389292 30006760 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 96149 340009 8256040 28080556 8 2390304 30014816 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 96498 340009 8278376 28088812 8 2391336 30023072 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 96840 340009 8300264 28096896 8 2392348 30031164 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 97182 340009 8322152 28104928 8 2393360 30039204 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 97523 340009 8343976 28112992 8 2394368 30047268 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 97864 340009 8365800 28121060 8 2395376 30055332 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 98205 340009 8387624 28129124 8 2396384 30063392 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 98547 340009 8409512 28137212 8 2397396 30071488 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 98888 340009 8431336 28145272 8 2398404 30079548 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 99229 340009 8453160 28153336 8 2399412 30087612 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 99570 340009 8474984 28161400 8 2400420 30095676 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 99911 340009 8496808 28169468 8 2401428 30103740 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 100253 340009 8518696 28177540 8 2402440 30111816 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 100596 340009 8540648 28185596 8 2403452 30119856 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 100938 340009 8562536 28193676 8 2404464 30127944 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 101279 340009 8584360 28201736 8 2405472 30136004 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 40373 834 326032 1934172 101620 340009 8606184 28209764 8 2406480 30144032 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 stingray ~ # dd if=/dev/zero of=/dev/pktcdvd/dvdrw bs=32769 count=25000 3525+0 records in 3525+0 records out 115510725 bytes (116 MB) copied, 77.7271 seconds, 1.5 MB/s niess@stingray ~ $ while true; do grep hdc /proc/diskstats ; grep pktc /proc/diskstats ;sleep 1;done 22 0 hdc 41039 834 331360 1940368 107487 340009 8981672 28348236 1 2430020 30288608 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41186 834 332536 1941300 107487 340009 8981672 28348236 1 2430948 30289536 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41333 834 333712 1942228 107487 340009 8981672 28348236 1 2431876 30290464 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41480 834 334888 1943184 107487 340009 8981672 28348236 1 2432836 30291424 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41628 834 336072 1944152 107487 340009 8981672 28348236 1 2433800 30292388 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41776 834 337256 1945096 107487 340009 8981672 28348236 1 2434744 30293332 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 41924 834 338440 1946048 107487 340009 8981672 28348236 1 2435700 30294288 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42073 834 339632 1947004 107487 340009 8981672 28348236 1 2436656 30295244 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42229 834 340880 1948000 107487 340009 8981672 28348236 1 2437652 30296240 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42378 834 342072 1948920 107487 340009 8981672 28348236 1 2438576 30297164 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42528 834 343272 1949924 107487 340009 8981672 28348236 1 2439576 30298164 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42678 834 344472 1950844 107487 340009 8981672 28348236 1 2440500 30299088 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42829 834 345680 1951840 107487 340009 8981672 28348236 1 2441492 30300080 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42872 834 346024 1952120 107495 340009 8982184 28348384 0 2441796 30300504 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42872 834 346024 1952120 107495 340009 8982184 28348384 0 2441796 30300504 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42872 834 346024 1952120 107495 340009 8982184 28348384 1 2441868 30300576 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42873 834 346032 1952372 107534 340009 8984680 28354880 8 2442876 30307376 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42875 841 346072 1953056 107616 340009 8989928 28357452 1 2443780 30310872 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42876 841 346080 1953540 107617 340009 8989992 28357460 1 2443984 30311076 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42987 841 346968 1954184 107624 340009 8990440 28357576 0 2444576 30311760 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42988 841 346976 1954412 107650 340009 8992104 28358132 8 2445188 30315052 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 42988 841 346976 1954412 107651 340009 8992168 28358872 8 2446196 30323116 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43059 841 347544 1954916 107747 340009 8998312 28371748 1 2447096 30326668 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43104 844 347912 1955784 107755 340009 8998824 28371884 0 2447728 30327668 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43105 844 347920 1956012 107781 340009 9000488 28372452 8 2448344 30331000 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43105 851 347920 1956012 107876 340009 9006568 28380988 2 2449248 30337280 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43108 851 347968 1957188 107877 340009 9006632 28380996 0 2449820 30338184 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43218 851 348848 1957784 107885 340009 9007144 28381124 0 2450444 30338908 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43218 851 348848 1957784 107885 340009 9007144 28381124 0 2450444 30338908 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43219 851 348856 1958028 107911 340009 9008808 28381676 8 2451124 30342640 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43220 862 348864 1958208 108005 340009 9014824 28390064 2 2452028 30348508 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43222 862 348920 1959104 108006 340009 9014888 28390068 0 2452476 30349172 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43332 862 349800 1959720 108014 340009 9015400 28390204 0 2453120 30349924 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43332 862 349800 1959720 108014 340009 9015400 28390204 0 2453120 30349924 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43333 862 349808 1959936 108040 340009 9017064 28390772 8 2453900 30354652 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43334 865 349816 1960160 108135 340009 9023144 28399232 2 2454800 30359816 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43336 865 349840 1961016 108136 340009 9023208 28399240 0 2455136 30360256 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43503 865 351176 1961852 108136 340009 9023208 28399240 1 2455976 30361096 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43560 865 351632 1962072 108143 340009 9023656 28399336 1 2456280 30361472 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43561 865 351640 1962300 108170 340009 9025384 28400580 8 2457288 30368384 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43561 876 351640 1962300 108266 340009 9031528 28413160 2 2458188 30375468 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43564 876 351704 1963412 108267 340009 9031592 28413164 0 2458856 30376576 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43668 876 352536 1964044 108267 340009 9031592 28413164 1 2459488 30377208 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43675 876 352592 1964068 108274 340009 9032040 28413252 1 2459724 30377512 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43676 876 352600 1964296 108301 340009 9033768 28414500 8 2460732 30385324 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43676 879 352600 1964296 108396 340009 9039848 28427120 2 2461636 30391672 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43679 879 352632 1965348 108397 340009 9039912 28427128 0 2462152 30392476 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43790 879 353520 1965948 108405 340009 9040424 28427248 0 2462776 30393196 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 22 0 hdc 43790 879 353520 1965948 108405 340009 9040424 28427248 0 2462776 30393196 254 0 pktcdvd0 0 0 0 0 0 0 0 0 0 0 0 niess@stingray ~ $