search for: 4mb

...9;t this limit memory size of the guest we can report? > > Apparently to several gigabytes ... > > OTOH huge guests with lots of free memory is exactly where we would gain > > the most ... > > Yes, the 16-page array can report up to 32GB (each page can hold 512 addresses of 4MB free page blocks, i.e. 2GB free memory per page) free memory to host. It is not flexible. > > How about allocating the buffer according to the guest memory size (proportional)? That is, > > /* Calculates the maximum number of 4MB (equals to 1024 pages) free pages blocks that the syste...

...9;t this limit memory size of the guest we can report? > > Apparently to several gigabytes ... > > OTOH huge guests with lots of free memory is exactly where we would gain > > the most ... > > Yes, the 16-page array can report up to 32GB (each page can hold 512 addresses of 4MB free page blocks, i.e. 2GB free memory per page) free memory to host. It is not flexible. > > How about allocating the buffer according to the guest memory size (proportional)? That is, > > /* Calculates the maximum number of 4MB (equals to 1024 pages) free pages blocks that the syste...

On Fri, Jun 15, 2018 at 12:43:11PM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free page hints by sending a command > to the guest via setting the VIRTIO_BALLOON_HOST_CMD_FREE_PAGE_HINT bit > of the host_cmd

On Fri, Jun 15, 2018 at 12:43:11PM +0800, Wei Wang wrote: > Negotiation of the VIRTIO_BALLOON_F_FREE_PAGE_HINT feature indicates the > support of reporting hints of guest free pages to host via virtio-balloon. > > Host requests the guest to report free page hints by sending a command > to the guest via setting the VIRTIO_BALLOON_HOST_CMD_FREE_PAGE_HINT bit > of the host_cmd

Chip Clock HT Cache Bus Speed --------------------------------------------------------- 5080 3.7 GHz YES 2MB 1066 MHz 5160 3.0 GHz NO 4MB 1333 MHz Does the .7 GHz and HT worth more then 4MB cache and higher bus speed? The application is VoIP so there is not a lot of IO so I would not think Bus Speed would matter. I am finding mixed information on HT, some say it is great, others say it actually slows things down, could this be why t...

...ould be much more complex than what we have. I think your idea of > > > passing a list of pages is better. > > > > > > Best, > > > Wei > > How much memory is this allocating anyway? > > > > For every 2TB memory that the guest has, we allocate 4MB. Hmm I guess I'm missing something, I don't see it: + max_entries = max_free_page_blocks(ARRAY_ALLOC_ORDER); + entries_per_page = PAGE_SIZE / sizeof(__le64); + entries_per_array = entries_per_page * (1 << ARRAY_ALLOC_ORDER); + max_array_num = max_entries / e...

...ould be much more complex than what we have. I think your idea of > > > passing a list of pages is better. > > > > > > Best, > > > Wei > > How much memory is this allocating anyway? > > > > For every 2TB memory that the guest has, we allocate 4MB. Hmm I guess I'm missing something, I don't see it: + max_entries = max_free_page_blocks(ARRAY_ALLOC_ORDER); + entries_per_page = PAGE_SIZE / sizeof(__le64); + entries_per_array = entries_per_page * (1 << ARRAY_ALLOC_ORDER); + max_array_num = max_entries / e...

Hi all, I am trying to find out why the minimum memory allocation for a domu is 4MB. I am running MiniOS and a small application that requires no more than 8 KB or RAM. Can anyone give me a comprehensive answer to this question, i am really looking to get to grips with this in detail. Is this an arbitrary decision, or is there something more meaningful at work here? Thanks Pa...

...f > > > > > passing a list of pages is better. > > > > > > > > > > Best, > > > > > Wei > > > > How much memory is this allocating anyway? > > > > > > > For every 2TB memory that the guest has, we allocate 4MB. > > Hmm I guess I'm missing something, I don't see it: > > > > > > + max_entries = max_free_page_blocks(ARRAY_ALLOC_ORDER); > > + entries_per_page = PAGE_SIZE / sizeof(__le64); > > + entries_per_array = entries_per_page * (1 <<...

...f > > > > > passing a list of pages is better. > > > > > > > > > > Best, > > > > > Wei > > > > How much memory is this allocating anyway? > > > > > > > For every 2TB memory that the guest has, we allocate 4MB. > > Hmm I guess I'm missing something, I don't see it: > > > > > > + max_entries = max_free_page_blocks(ARRAY_ALLOC_ORDER); > > + entries_per_page = PAGE_SIZE / sizeof(__le64); > > + entries_per_array = entries_per_page * (1 <<...

...ot;); > > Doesn't this limit memory size of the guest we can report? > Apparently to several gigabytes ... > OTOH huge guests with lots of free memory is exactly where we would gain > the most ... Yes, the 16-page array can report up to 32GB (each page can hold 512 addresses of 4MB free page blocks, i.e. 2GB free memory per page) free memory to host. It is not flexible. How about allocating the buffer according to the guest memory size (proportional)? That is, /* Calculates the maximum number of 4MB (equals to 1024 pages) free pages blocks that the system can have */ 4m_pag...

Based on your message, it sounds like your total usable capacity requirement is around <1TB. With a modern SSD, you'll get something like 40k theoretical IOPs for 4k I/O size. You don't mention budget. What is your budget? You mention "4MB operations", where is that requirement coming from? On Wed, Apr 4, 2018 at 12:41 PM, Vincent Royer <vincent at epicenergy.ca> wrote: > Hi, > > Trying to make the most of a limited budget. I need fast I/O for > operations under 4MB, and high availability of VMs in an Ovirt...

...> > > Apparently to several gigabytes ... > > > > OTOH huge guests with lots of free memory is exactly where we would > > > > gain the most ... > > > > > > Yes, the 16-page array can report up to 32GB (each page can hold 512 > > addresses of 4MB free page blocks, i.e. 2GB free memory per page) free > > memory to host. It is not flexible. > > > > > > How about allocating the buffer according to the guest memory size > > > (proportional)? That is, > > > > > > /* Calculates the maximum number...

...2390172:2391632(1460) ack 4719 win 5840 NBT Packet (DF) I've also read that CIFS can work "raw" (i.e. outside of NBT) but I'm not sure how to do it or if it'll help. Testing with NFS and FTP has shown that I can hit 9.6MB/sec with larger packets, but am stuck down around 4MB/sec with these measly 1-2k packets. I am pretty sure it's not a Samba-side issue because if I start four or five transfers from different workstations I can easily aggregate their individual transfer speeds and get 20MB/sec on the GigE interface. I am drawing up blanks so I'm hoping on...

...the guest we can report? > > > Apparently to several gigabytes ... > > > OTOH huge guests with lots of free memory is exactly where we would > > > gain the most ... > > > > Yes, the 16-page array can report up to 32GB (each page can hold 512 > addresses of 4MB free page blocks, i.e. 2GB free memory per page) free > memory to host. It is not flexible. > > > > How about allocating the buffer according to the guest memory size > > (proportional)? That is, > > > > /* Calculates the maximum number of 4MB (equals to 1024 pages)...

...s split in to number of 4KiB blocks OS: CentOS 7.3 kernel Version: 3.10.0-514.el7.x86_64 Any IO (write) block size more than 4KiB is split in to number of 4KiB blocks on Centos 7.3 ( where I don't see similar issue on 7.2). I have a setup that involves TWO CentOS 7.3 servers. I tried to run 4MB IO on FC LUN(s) on these servers discovered through Emulex LPe 16000 HBAs. Changed ?options lpfc lpfc_sg_seg_cn =>1024? and ?max_secors_kb =>4MB? params towards attaining supersize IO ( 4MB block size) , however there are no improvements in getting more than 4K block size IO. There was no i...

...s split in to number of 4KiB blocks OS: CentOS 7.3 kernel Version: 3.10.0-514.el7.x86_64 Any IO (write) block size more than 4KiB is split in to number of 4KiB blocks on Centos 7.3 ( where I don't see similar issue on 7.2). I have a setup that involves TWO CentOS 7.3 servers. I tried to run 4MB IO on FC LUN(s) on these servers discovered through Emulex LPe 16000 HBAs. Changed ?options lpfc lpfc_sg_seg_cn =>1024? and ?max_secors_kb =>4MB? params towards attaining supersize IO ( 4MB block size) , however there are no improvements in getting more than 4K block size IO. There was no i...

I just thought I'd throw this out there because it doesn't seem normal to me. We have 2.0.5a on AIX 4.3.2. We initially tried to increase the shared mem size to 4MB. This would not happen until we rebooted AIX. Then smbstatus reported a 4MB shared mem size. Now we are trying to decrease it because we will only need about 2MB and it won't reduce. I suspect it will when we reboot again. This does not seem like normal behavior to me. Could someone from the T...

Hi, Trying to make the most of a limited budget. I need fast I/O for operations under 4MB, and high availability of VMs in an Ovirt cluster. I Have 3 nodes running Ovirt and want to rebuild them with hardware for converging storage. Should I use 2 960GB SSDs in RAID1 in each node, replica 3? Or can I get away with 1 larger SSD per node, JBOD, replica 3? Is a flash-backed Raid requir...

Hi I'm finding it takes ages to download a roaming profile from the server when I log into Win2k or XP. A 4Mb profiles typically takes about 2 minutes (and 2 minutes to write back when I log out). I did a test and copied the profile directory from the server to my PC. Running under Win98 takes 1-2 minutes. Under 2K/XP it takes nearly 5 minutes. However, a single file of 4Mb only takes about 10 seconds. I...