search for: blktrace

the -k option was missing from the usage() output and was present only in the man page synopsis. Say a few more words about it. Signed-off-by: Eric Sandeen <sandeen@redhat.com> --- diff --git a/blktrace.c b/blktrace.c index 89aaaac..4e96573 100644 --- a/blktrace.c +++ b/blktrace.c @@ -450,6 +450,7 @@ static char usage_str[] = "\n\n" \ "[ -p <port number> | --port=<port number>]\n" \ "[ -s | --no-sendfile]\n" \ &...

Hi, The following patch adds ioprio to blktrace. Explanation: As you know, I/O schedulers such as cfq use io_contexts of current tasks to schedule block I/O. But recently, some are suggesting to use more appropriate io_contexts obtained by, for example, doing io-tracking, making struct bio have io_context member, etc. I thought adding ioprio to...

I keep reading that RHEL/CentOS 5 supports blktrace, but I can't seem to find the blktrace/blkparse utilities. Is it that just the functionality is available in the kernel, but the user is left to have to hunt down the latest versions of the utilities on the net? If anybody knows where to get the latest versions of these utilities I would gr...

Ok, I got blktrace installed, but I also have some blktrace system taps that I want to test out, but it seems I need to have the kernel debug info installed to get systemtap working. Anyone know where the CentOS kernel-debuginfo RPMs are located? Ross S. W. Walker Information Systems Manager Medallion Financial,...

Hi, the $subj warning appears sometimes in syslog, in my case when xfstests/209 runs looped. The minimal reproducer is looped mkfs+mount. The message comes from disk-io.c btree_readpage_end_io_hook(): 581 if (check_tree_block_fsid(root, eb)) { 582 printk_ratelimited(KERN_INFO "btrfs bad fsid on block %llu\n", 583 (unsigned long

Today, I had to uncleanly shutdown one of our machines due to an error in 2.6.28.3. Durin the boot sequence, the ext4 partition /home experienced a journal replay. /home looks like this: /dev/mapper/volg1-logv1 on /home type ext4 (rw,noexec,nodev,noatime,errors=remount-ro) Filesystem Size Used Avail Use% Mounted on /dev/mapper/volg1-logv1 2,4T 1,4T 1022G 58% /home Filesystem

...ion: failed Status: 5.0.0 Diagnostic-Code: X-Spam-&-Virus-Firewall; host 10.101.1.19[10.101.1.19] said: 554 5.4.6 Hop count exceeded - possible mail loop (in reply to end of DATA command) " My question is: I'm try to see what happening when virtual machine write to disk and run blktrace from dom0 like this blktrace -w 60 -d /dev/disk/vbd/21-920 -o - > test.trace /dev/disk/vbd/21-920 is the software raid contains 2 lv volumes , each lv volume created in big srp attached disk Inside vm i try to do some work via fio: [global] rw=randread size=128m directory=/tmp ioengine=libaio...

...s about an issue newer kernels show, bysplitting direct I/O requests into 4k pieces to directly merge them in the Block Device Layer afterwards. If anyone is interested in own tests just use a simple command like dd if=/mnt/test/test-dd1 of=/dev/null iflag=direct bs=64k count=1 in combination with blktrace. The following patch is more a proposal for discussion than a solution, well thats what RFC''s are about right. I''m unsure about names, but also if the approach in general is the right way. It should apply to every 2.6.36 and 2.6.37 kernel. I put everyone on CC who was involved i...

...rspace are broken up in 4k bio''s and then re-merged by the ioscheduler before reaching the device driver. Eventually that means +30% cpu cost for 64k, probably much more for larger request sizes - Throughput is only affected if there is no cpu left to spare for this additional overhead. A blktrace log is probably the best way to explain this in detail: (sequential 64k requests using direct I/O reading a 2Gb file on a ext2 file system) Application summary for iozone : BAD: GOOD: iozone (18572, ...) iozone (18482, ...)...

...cript to demonstrate this > effect > -- it will read /proc/diskstats in a tight loop, and keep track of > which request entered the request queue when, and when it completed, > and > it will WTF if a request took more than a second. (The same thing can > probably be done with blktrace, but I was lazy.) New requests get > submitted, but the pending ones fail to complete for a while, and then > they all complete at once. > > This happens on kernel-2.6.18-164.11.1.el5, while reverting to the > latest CentOS 5.3 kernel (kernel-2.6.18-128.7.1.el5) makes the issue &g...

Dear All, I am trying to trace all the disk I/O accesses made by the xen guest domains to dom0 domain. I would request for critics or comments in doing the same. Its easy to run "iostat -x" on all domains and dom0 to get the disk i/o utilization stats, but I am just looking if there can be any other way than running this utility in all domUs but using simply dom0 to get all guest

Hello, When approaching hosting providers for services, the first question many of them asked us was about the amount of IOPS the disk system should support. While we stress-tested our service, we recorded between 4000 and 6000 "merged io operations per second" as seen in "iostat -x" and collectd (varies between the different components of the system, we have a few such

...> physical blocks (as described in the comments). > > I also switched the if conditional following this check to an else if, > to ensure that we never call dio_bio_submit twice for the same dio (in > theory, this should not happen, anyway). > > I've tested this by running blktrace and verifying that a 64KB I/O was > submitted as a single I/O. I also ran the patched kernel through > xfstests' aio tests using xfs, ext4 (with 1k and 4k block sizes) and > btrfs and verified that there were no regressions as compared to an > unpatched kernel. > > Comments,...

I'm trying to do an fsck on an ext3 partition but I'm seeing abysmally slow disk throughput; monitoring with "dstat" (like vmstat) shows ~1200-1500KB/s throughput to the disks. Even with 24hrs of fsck-ing I only get ~3% (still in pass1). The filesystem is ext3 running "e2fsck -C0 /dev/sda3" and about 3.7TB on an x86_64-based system with 4GB RAM. e2fsprogs is 1.41.9.

Hi all, we got a new test system here and I just also tested btrfs raid6 on that. Write performance is slightly lower than hw-raid (LSI megasas) and md-raid6, but it probably would be much better than any of these two, if it wouldn''t read all the during the writes. Is this a known issue? This is with linux-3.9.2. Thanks, Bernd -- To unsubscribe from this list: send the line

Hello, I've used pungi with the following configuration: repo --name=centos-base --baseurl=ftp://mirrors/centos/6/os/x86_64 --cost=1 -- excludepkgs=qemu-kvm repo --name=centos-updates --baseurl=ftp://mirrors/centos/6/updates/x86_64 -- cost=1 --excludepkgs=qemu-kvm repo --name=xen4centos -- baseurl=http://mirror.centos.org/centos/6/xen4/x86_64/ --cost=1 %packages @base @core

it's strange since this kernel don't have kvm support, qemu or qemu-kvm or kvm package is not added. even though it was said that 5.4 will support kvm?:-( Tom "spot" Callaway wrote: > New Packages in RHEL 5.4 Beta: > ******************************** > blktrace-1.0.0-6.el5.src.rpm > celt051-0.5.1.3-0.el5.src.rpm > etherboot-5.4.4-10.el5.src.rpm > fcoe-utils-1.0.7-4.el5.src.rpm > fuse-2.7.4-8.el5.src.rpm > gcc44-4.4.0-6.el5.src.rpm > gnupg2-2.0.10-3.el5.src.rpm > hmaccalc-0.9.6-1.el5.src.rpm > iasl-20061109-5.el5.src.rpm > libass...

...Daniel Schepler <dschepler at gmail.com>. > submitter 516060 ! Bug#516060: backup-manager: FTBFS: Missing Build-Depends Changed Bug submitter from Daniel Schepler <schepler at math.berkeley.edu> to Daniel Schepler <dschepler at gmail.com>. > submitter 516062 ! Bug#516062: blktrace: FTBFS: Missing Build-Depends Changed Bug submitter from Daniel Schepler <schepler at math.berkeley.edu> to Daniel Schepler <dschepler at gmail.com>. > submitter 516336 ! Bug#516336: haskell-utils: FTBFS: Not in scope: `readPackageDescription' Changed Bug submitter from Daniel S...

Hi Alasdair and all, This is the dm-ioband version 1.10.5 release. This patch can be applied cleanly to current agk's tree. The only change from the previous version is that some blktrace messages are added by Alan D. Brunelle, thanks Alan. Alasdair, Could you please tell me your opinion about merging dm-ioband to upstream? What else do I have to do? Is there any possibility that dm-ioband is merged? Thanks, Ryo Tsuruta --- Dm-ioband is an I/O bandwidth controller implemented as...

Hi Alasdair and all, This is the dm-ioband version 1.10.5 release. This patch can be applied cleanly to current agk's tree. The only change from the previous version is that some blktrace messages are added by Alan D. Brunelle, thanks Alan. Alasdair, Could you please tell me your opinion about merging dm-ioband to upstream? What else do I have to do? Is there any possibility that dm-ioband is merged? Thanks, Ryo Tsuruta --- Dm-ioband is an I/O bandwidth controller implemented as...